Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2dd3c4e69e41551…

MALICIOUS

PDF

96.4 KB Created: 2021-07-26 02:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 68e6c1c304d1822370ced49220835b28 SHA-1: 80fe2b031e0c7723b000a7c4073d5b3a8bc28a92 SHA-256: c2dd3c4e69e415516c75404090d4942faf38cc32f4ae972c3e6f76f3258b6da4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://avonsteel.com/UserFiles/file/25108591949.pdf In PDF document text
    • http://www.deco-interieure.com/userfiles/file/dugazevufirofum.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/c71br5hg9h0ko7749740solu36/28368521118.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/kj8vh7sr4hed4gmlbcrro4hi5r/20587984576.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609990fb2e604---gaxetogomalijipo.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb0fe39f5f---68455835811.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-07-21/images/files/54844244585.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105040159128714.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/zoriwugupedir.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/4fd436b06db0b92f043791cbd8718c96/88502711621.pdfIn PDF document text
    • http://anpo.vn/upload/files/63768230631.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/kojomiwajododapolije.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/umcsl6i090lfhudgbdk6lq75qk/18043495906.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/70707b748190886009c24198552eeb9c/9351745976.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/82872625643.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/52272329303.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/5874616867.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/50941232439.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/gipexoge.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1d6727b4a---15045390473.pdfIn PDF document text
    • http://stylekd.ru/files/pinubivigovedotevat.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/napukupubilidi.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/peberutewarirokad.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c912e1e2325---76637658557.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/lumelorilep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+pronounce+medical+terms+correctlyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E92 19728 bytes
SHA-256: 92e086416bc490d29f9233264c61e6017d67c214a066fcecc196f8e9850ca828
font_02_sfnt_off00015152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15152 1704 bytes
SHA-256: b000ba784e06dfed05e5036781705fc03053f75fb86b6431fcd8f8bc5d31227b
font_03_sfnt_off00015964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15964 10964 bytes
SHA-256: 81b7f47d0edcaa397b61cb0bf0de52e4b049d3c202906ebe364e27f3011435ae

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