Malicious PDF — malware analysis report

Static analysis result for SHA-256 6973952e3b207613…

MALICIOUS

PDF

119.6 KB Created: 2021-07-25 01:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a9c60ed19c99799eb56a4e459fe10b70 SHA-1: 2e877685c1bae156c126e3a70e2d45b0adf8498b SHA-256: 6973952e3b20761342e97ad2aae6fd7a5f1390eeb20f3c2c523e86b827a60ce5
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond being a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://kaushalacademy.org/ckfinder/userfiles/files/kaxedivilagepodo.pdf In PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/dfaf77e12740a0e5576b81e4d57e693e/zosujewirewuwiwonari.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607646a4bb0e8---10590824800.pdfIn PDF document text
    • http://babamoleskine.com/files/file/48713903468.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/mirefonejavuminokus.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/lisetorezuvijikop.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22f5a1d4f0---rozoluzikufenezifakif.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/7888336142.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/5f2673df70416c288c41e8f436eaaad8/45075319543.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/791847cf5952579f3b0a0c6f8ab349a1/wekoza.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/vapuluzibubifaz.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/mixurotukedorelutiderinot.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5cc122df1---13372025278.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/39079190308.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/tekuzaxotiv.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a5aca608041---42305143793.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/sutomaxevipekujebaxuzax.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/72711944232.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/kijudutibulena.pdfIn PDF document text
    • http://accronline.com/userfiles/file/43693282969.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607addb819bbb---31732331434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=are+project+labor+agreements+legalPDF 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_off00017063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17063 17920 bytes
SHA-256: 66952302d52d52731914ca2a3cbd14dce56489148cd683377ada74d5182df976
font_01_sfnt_off00019fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7C7 10876 bytes
SHA-256: 8dcfb023a91a0982171e5dfa40639d9ff27fc0e706225e3dd8a2efdf9d6f0575

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