Malicious PDF — malware analysis report

Static analysis result for SHA-256 64212421420bf380…

MALICIOUS

PDF

87.5 KB Created: 2021-06-26 07:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 713c5bfb7a030c91bbca443a60807127 SHA-1: 4af7bb9d5afbe57ddb752877f52d8e05f0c184c6 SHA-256: 64212421420bf380a6ebd679625e04e09f9c90e6f59123760e4401f1d449f75e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://solidpractise.com/files/userfiles/file/33762022171.pdf In PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/bcd7dcee77a8e3fabf3e985a7e4232df/48019710140.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/ad77857971e2b9cdf72a62da270f68ef/41104456963.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/48628685c8c077f0051d1ff58bac5028/pivarozisazuvo.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/55856863923.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdef4e3d5c6---kojijedezotajagipejax.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ca4e30508c34e65d5753415ad3960cb3/tijuv.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d90872010bc7405d35e2fe882e1961b8/3037183227.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/esitog.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5d752f1a3---dufepalonat.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1571667b9914c3d8a28382288a46971f/deguxitamabugukuzatilam.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f036ab5c6b932c1748bdc13dc1209b28/8850852921.pdfIn PDF document text
    • https://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/325ba0d93deddc662c0a64b087028029/15226823053.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d408a58cca---jegiziwesorimok.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b9042564d95eca10b97b53354a90baaa/kozatolikuzitixojuruf.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/0e2ff3fa527a6deaf17231aa69b09852/tudunexagogap.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/68613998839.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/latiwetuxax.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7972fb2464---bawaguboke.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/13776888827.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/92945450598.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/03293661e7aa5a67286c01ac6166ed0e/17463855360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=asian+groceries+incPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d49e773c5d88162ef00dee00eb2124c7/19766390467.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
font_00_sfnt_off0000d161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD161 17412 bytes
SHA-256: 1556fb60eaa0e53d9441c92bd2b8241e7240a39fc794d02def074937092b2b89
font_01_sfnt_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001174d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174D 10244 bytes
SHA-256: b940bd6ebf2142570a118fe382b457f2e2dfdb718e0fafbaa278d389b635aa99
font_03_sfnt_off00012e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E69 17024 bytes
SHA-256: aeb70b7d0ae3c5278cec8a3f316772c5bc3a8fe0377783774eb9f64fbbe796b3
font_04_sfnt_off000146d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D8 1944 bytes
SHA-256: 480ca70a074f51d0bcf4a6a177d88ef81aac69483c382d25c13f3ef0452f496b

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