Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a6ea6585b114b5…

MALICIOUS

PDF

99.9 KB Created: 2021-07-19 10:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 524bd0f5929c7b4ed686bc1816226dd4 SHA-1: 1bee9893a75419a6b2b44629c844b42c737ab2cb SHA-256: 39a6ea6585b114b521ab24f09c2eb17325110c1745441bebbc13a0b0c79ffe67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://sushistoryus.com/uploads/files/25825712625.pdf In PDF document text
    • https://transit-connection.com/userfiles/files/98944209812.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/wabozukoxosokobokuge.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/32115168949.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3f4e6dac2---72144188971.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/84dd689f5b22c76c2029276489cd1117/tifaxabi.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/zamamavotuturatemulurimof.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/75eb65f0f79528617a20de15b9bf2029/7547503646.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/f22d7738cb4a7d9a9236dd581599fa67/fowedavot.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/zibewoloz.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fde697945e---53425779038.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a03e37c2cd8---3274166240.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ac49faa9d7fe5516f1103e1e9cc0e210/20904883330.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/50431825928.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/dfefb20e53b90d0d3f92cf794b73583b/motaw.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708411c561b---nopifibegoxizudokezife.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d24d867fb61---59892200328.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/jizeliwowuvogisopixulevup.pdfIn PDF document text
    • http://derma-dts.de/files/file/33018414123.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/72010894544.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/og3jq2umjmi4fskq59v9j89vc4/7937259170.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf41841bb8---zerodonizasis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=square+root+of+2601PDF 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_off000122a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A9 10580 bytes
SHA-256: d2ec7f40a37d0760e8d2851db7ffca7875da20e95175a308b9bb71b46e588809
font_01_sfnt_off00013b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15327 17708 bytes
SHA-256: 66066945f4ea2106606056b6633a02eb0c6984893a599caab55ee5d9d146f397

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