Malicious PDF — malware analysis report

Static analysis result for SHA-256 848db4d937d4698e…

MALICIOUS

PDF

91.4 KB Created: 2021-07-13 06:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 345441be6ff812244580c4afd48cebda SHA-1: 44da32a18cbb0ad77593466f52694e767525b8f9 SHA-256: 848db4d937d4698e1632f0853797581c4cd08145ed1375ba52fa11dd55d04ace
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure as a link farm is designed to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/4hotb6lqan2mc03rh2ssp5c5dg/45599419962.pdf In PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160daf1dcc8b9c---91167856846.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4843a11ac2---rojiripejesudutodesafu.pdfIn PDF document text
    • http://www.toptehnik.si/images/loxopotigasizemareboxujiw.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4rtsmd8ce88aljndbv301ck6b6/tufoxexex.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e22dc9e2c44---71755625422.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e3260ca3f1fab4126aa58235b81e7707/jugiponamonizoripof.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/8e104484f5f9b62c3df1fccc5e9b6bea/58519776062.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/13943054611.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/vopudaxir.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/guledafakemajifapo.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/gobef919r846bvvmibkqdogii7/60104981445.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ldng9dmm9kgni81gngo4s046pa/rupepotasiwefowu.pdfIn PDF document text
    • http://araonline.hu/uploads/file/kewuveduxifogefur.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/aohknmgjum01fuqnrmb5vvaa6f/rerixilebinatir.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/194234dd59606cf3d2093e6b467a4922/51063524783.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/3942369421.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/uqtr7bkdfp0fje8oqmmj3as3rt/zuxodeves.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/r5aidufuhv3utmtu4s7577vjt2/bijedexanawafutaz.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/rinisurisalomononuxumow.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/rejusipufegure.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/55019880331.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/3834682161.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/87571489469.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/39011266481.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160749f837aacd---52630947485.pdfIn PDF document text
    • http://redactron.com/userfiles/file/44449352779.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe7317432e---kofakegewajafuzon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=assertive+woman+in+a+relationshipPDF 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_off0001027a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027A 10648 bytes
SHA-256: fafef3f01913b5477a4a7fb364412bf999e0c3a143f3de8d4b0f2d2e15343619
font_01_sfnt_off00011abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CE 16820 bytes
SHA-256: 977343c0b73d4ed0c35fb248b26905b62b68e0d03793704bf716adb3d938eee9