Malicious PDF — malware analysis report

Static analysis result for SHA-256 a075bb1671971ef9…

MALICIOUS

PDF

107.2 KB Created: 2021-07-04 21:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 452955513eca052c88cf9aa4b8a6a21e SHA-1: b7f53e1a8ba45e1b10e01c314d49d3b2f3576fc9 SHA-256: a075bb1671971ef9cccdb49a721086720ddafa3e35149f5c7b435866eb5b0663
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9279

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://reicar.dk/userfiles/file/vojuronal.pdf In PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/bf1e923643f0bdda01c1ce7ec6771539/18074460133.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/490dd7e0079731d5912d5817faea389a/38825114148.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d43b3e72a1---lebufajuvebu.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/78621af704a8728f2d956323bb97f36e/49805855113.pdfIn PDF document text
    • http://hotstamping.pl/files/file/12197298664.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/lujijuturugavezu.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/malidusizixelaletakonaxog.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/31047704f96f0cd789baefc1bc052c01/51139002701.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/2qrd7s68dgjbgt4706t4m504t6/23182849544.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/lcpau1ic91uopefi31m73mcglv/jobikosuted.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/48b7eee157f58feababaefb91d5bf383/tebunu.pdfIn PDF document text
    • http://huiking.cn/uploads/file/261927101350.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608515abbeba0---rotumojubuvenin.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/eef3eca47201de071ef35a6b637161b3/14758742528.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/4152d97b4f4a957044fc1e75e564c235/nalanowu.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/47743357718.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/xoxagoxiradapezesiwuf.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cbd6cf8b8---92938035092.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc76f42301---rosegiva.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/ximebukefunivefaziwado.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1ff0cd71c---857421238.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b6b2cecb3edbb2d369c1b809192f8f00/bemaxakudefitomes.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a679c021273---bosuzamowe.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/0c0093cd55cdabfdbc2903d335760941/gonojiminaben.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf8a36f5eb---dutilipitisitifojoxaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+sonic+mania+apkPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/58786585969.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016288.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16288 20740 bytes
SHA-256: fb6bf94a97c259b00f123811c3d03902c4a260762b51341995c897f1ac60a213
font_00_sfnt_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E88 28964 bytes
SHA-256: 3d9958c6b84785777d7b1a7772f466b8c9192afd313ea1688f91c881c28e6284
font_02_sfnt_off000155b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155B7 3200 bytes
SHA-256: b4695dfed51f494d3e5aaaa92d883fea89281739b14d45a7e5a8c12ee1647a1d
font_04_sfnt_off00018604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18604 10524 bytes
SHA-256: 28d1ce9b14262c4a4df34802f14d07bce337b52ae0a56a5c346cbd5de4431407

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