Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c81ec0726066ce1…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 22:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a252e4839512b8f824af9914e674485c SHA-1: 3fb3af5dad41b6d029bd10c489497fb0f60859d4 SHA-256: 7c81ec0726066ce16109d9e39d14823fa9ae675f946423c50c6ea453c79f2124
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing or trojan delivery mechanism. The document contains a link farm pointing to various URLs, many hosted on compromised WordPress sites, which likely serve as download locations for further malicious payloads. The presence of external URIs and link farms suggests an attempt to redirect the user to malicious content, potentially disguised as legitimate documents like visa applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://allytemp.ru/uplcv?utm_term=saudi+visa+application+pdf PDF link annotation
    • https://infotechloyalty.com/bot/ckfinder/uf/files/sawap.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/0479e77e36cc680e1adf1aabc6d255c9/zavigitariwarukegepop.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/feb6d7a90ec15d406596af05803d96c8/73240845393.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd479a0353---komenivitilotugoguzevuro.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/dumej.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/19652846127.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/gexerisuranetan.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/xolebixakogupizog.pdfIn PDF document text
    • http://getem.eu/files/file/majeroduk.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/9e28fbfefd74c60d0af5a62f9cd402c3/97940552597.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/vefuper.pdfIn PDF document text
    • http://yuhongzg.com/d/files/rajuwoxafebegog.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81e0f4d4f5---52368353195.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882609a8053---506260605.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ef27a4ec7aec3828a56d011febb13749/86728555833.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f15317adaa---patazisagoloxakuzunemusif.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/wisusatagiwadamivo.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/8f8d499a98e90bc5815e6459d858d44f/19344285319.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/jibimo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c5435d91---balewojubusupivelejejoju.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/fusebenozaxidoxotuz.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/543ab10baececd60caab66966fa8775b/15168777069.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 10624 bytes
SHA-256: a410408dabcf5e21d8721eb9d9e36f7fc470d4da42a9ff22d167937eb1e61598
font_02_sfnt_off00010a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A20 17216 bytes
SHA-256: 8d351b62df7d9d5549e367dfbb08fbd73c02f15e852811549029fde035fe77a1

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