Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9d3feb22e3c77e…

MALICIOUS

PDF

79.1 KB Created: 2021-06-30 17:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: aaf8ff08b6e79bbf8bb447401e03e91b SHA-1: f14cef07ac7416d4e1b6b49f45e1f0436c53fc7c SHA-256: fd9d3feb22e3c77e7c7760c430de4d2d9b2abecee93909cbdb6693e12859e7c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the link farm nature is clear from heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://megat.pl/uploaded/fck_files/file/29082217567.pdf In PDF document text
    • http://wildpflanzen-planung.de/file/61714555214.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1624623877mijomivikiwi.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/e0pac28ca71tj9oomkdcrqvdlo/jabitasefedamikok.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/vewasumebofodebup.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/df73180f25cdb00c9dd19e106d82e3c3/lodujikijejilemuf.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/db8c7e428487d9b5a7ce3f75c636f971/24885065075.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/86545896329.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//lujuwi.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/q33es0p0icoglqcmubhnnrva9k/64457841741.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/19633455654.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/kqf32tkcq2sp6bld3un6sh8ip6/wepolotujilag.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/fc2988e233d6dc5c68c962f9a88c4e62/muzebututekolisifowinizig.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/53906175753.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/43e9fd3f2f6776b7f24d595b16410d6b/xepofulukat.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/o5olg7ml57o3c8mi8dj1q1r503/zaxetigusevotewifa.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/46702416217.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/jorugix.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210616_153A66DD4D5AE6C8.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/pemufitotibifidobo.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/wewapitemipajabinukifad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+reupholster+a+carPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 10452 bytes
SHA-256: e91bb743a1ce83b5296c4b0eb019bd877be589bc3e12adc5cb9453f11842a614
font_02_sfnt_off00010482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 16520 bytes
SHA-256: 004f1d06f4c6114d1ca7208427aeb8955d68634a54c45c4798eca56a7f7ebdef

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