Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1fb680432bc0e4…

MALICIOUS

PDF

97.2 KB Created: 2021-07-09 14:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a973f430f438cec14c780d9ce8b56756 SHA-1: 90faea489537776212a1ac9f7726c2ecd56982a5 SHA-256: 7f1fb680432bc0e427ceae1e9f76b372b7c1921e5a4e1c393ef6bbc50fcf67b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for malicious content. The document's structure and the presence of external URIs suggest an attempt to lure users to malicious websites, potentially for credential harvesting or further malware infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://laborke.ru/uplcv?utm_term=homemade+egg+roll+wrappers PDF link annotation
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab8b1802e9---18013937379.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160985f9a58977---62431291044.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/lj9kmprhbtaqc4jv7chtohc74h/fogulamepepotevapa.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/24450230992.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/ralevu.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/0f30f491a87a5279f35b0975f5bccb3c/matarokebonox.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/vuzisesegapi.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/39791912207.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f8a61f974a5641f338bf29d3dd6892da/19328979444.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e9e693a3---japuzi.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/23392425895.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/32180932512.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/susifetiwemovulomeje.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ba12e6b617f---gonibazemifufuwa.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cffd150db1---tumozofalowa.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/67835577980.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/90828358389.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a67780e5470---77361449108.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d53d90198e4---63112068640.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc0d37390d---doxubobopotapora.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11984 17776 bytes
SHA-256: cc33c0d0e921767f6289ad28cf31b634a2ac7c6bfd1d4487bf1a50e64ad9570c
font_01_sfnt_off0001484d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1484D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16064 10520 bytes
SHA-256: 99fa991340de26e7cd3a924803fb9bf48d9f31c27369b345df1a23abed310169

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