Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26746bf226f6eaa…

MALICIOUS

PDF

73.5 KB Created: 2021-09-05 09:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a7492d64d53f36cc5bd75d0f0b82e17 SHA-1: 391962575beb960588f482e2cfa8e84754f46944 SHA-256: c26746bf226f6eaad1e58ed0b05d9849a1ed729c7276a1afb0d75d208c525dbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites, acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's part of a phishing campaign, likely delivered as an attachment.

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 https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/20948648fcadc365101c706834cb0064/60187326794.pdf In PDF document text
    • http://www.anclupnapoli.it/userfiles/file/96468390590.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d99d1b77f82---zajobesuz.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f2fe4ef4916807debbc792ca290353eb/56858135216.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161095c7ec8437---86965781476.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/94604028173.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/17600938081.pdfIn PDF document text
    • http://nktrading.qa/file/files/44964777974.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098cf80bd323---lemotu.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/7a4b81304149090e82c2d01f224fe697/fimofuvo.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/62659311346.pdfIn PDF document text
    • https://faceless.me/userfiles/files/40426344154.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610c8b34b768c---zawipenufofazitepij.pdfIn PDF document text
    • https://p87.hu/files/pixuzijovojofu.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/giziroxur.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/bidikefupefilokasibalom.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/76248071001.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160754f8ec7081---45815397779.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/c4fb1de729911de6c246e886c362dbdb/16996589382.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/lisudabujetunuwavesug.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/bomufoxesamunikebaziva.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/49167392617.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/85709524457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ganapati+stotram+tamil+pdfPDF 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_off0000b7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC6 18644 bytes
SHA-256: 4905cc00f9d753caaf654126246bfd55d7b22f3e24af95aa304f02d752440aee
font_02_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 10564 bytes
SHA-256: 4943e101eb3852a62be764a56efa5a907374444f0034a91715be75a384abd8fb

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