Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ba37aeaa5b7a2a…

MALICIOUS

PDF

76.4 KB Created: 2021-09-04 00:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ac6ebd02ebb9a2d2f1697cf4ccdd1c2 SHA-1: e0e9fcf1ac3bc5314c31182396314f8c1de3adda SHA-256: b7ba37aeaa5b7a2af7287b333ca491e652524dc6d009f89950c9dde3db80ef08
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=solving+polynomial+equations+worksheet+pdf PDF link annotation
    • http://andlupa.com/userfiles/file/94877878463.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/k1l0u31k5emnrhhgcfpr9j2tl0/67965828270.pdfIn PDF document text
    • https://baongochoa.com/upload/file/50471974028.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/50066803269.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/vupirudew.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdccabac79---40095692152.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/welidopadatubete.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607266a9a6f62---24289712935.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ua1t7a5a6v0l591brf37lf9nv8/zelabunofo.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/b98pu8i4u48c8cfphapr0b7qk2/paduvubojibuf.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/48315427604.pdfIn PDF document text
    • http://fruitofthespiritcatering.com/clients/9/9e/9e5e3efd27976f294ade36eaf76108d7/File/viralabenifozununatuv.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb6bfe6342---32890143377.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/58183573866.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d216c5977ea---powulerokawewiloburona.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/litinasokuwuvuxevewogaf.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/dubm52hqmrqjj2idbf2iafnlr0/xuxumesutinuv.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983e0cd0090---62155407189.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081f58f99cfc---nejebatexizil.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f70b374c18b---54504869904.pdfIn PDF document text
    • http://compsult.net/userfiles/file/55519208583.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/pidazase.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/81812860337.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1ea5f7bfa1913042e8b4a45f96010941/48128052068.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_off0000c348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC348 17372 bytes
SHA-256: 38766afb7903d8e1df7a6b8ec3a4d3019c0e7536664b1ef35bcaa7c2b26eb790
font_01_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 11624 bytes
SHA-256: afde59e6360b78321d538f903eb194d5e2b4358c91243318d0ff174f9a041d6b

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