Malicious PDF — malware analysis report

Static analysis result for SHA-256 701887d4d912eaf3…

MALICIOUS

PDF

87.4 KB Created: 2021-07-13 02:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1941598ed07e9cf709e73897a22d26a3 SHA-1: 41a291daa5c873939d7ff8e633837e42cb455255 SHA-256: 701887d4d912eaf36099a208d0fbc79f9a9c1dbcf1527dd047e421da1a528c31
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs that point to compromised websites, likely intended to lure users into downloading further malicious payloads or engaging in phishing activities. The presence of multiple links on disposable or compromised hosting reinforces its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/47756926895.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a408e6798---4757894863.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/bpa2klvn796umdr12tuvmv8h60/dufozodasix.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb629c1a2e---30718781449.pdf
    • http://ajmason.com/admin/ckfinder/userfiles/files/34681305973.pdf
    • https://minhkygroup.com/luutru/files/7960380552.pdf
    • https://aspirans.com/files/file/36206617937.pdf
    • http://lyzebrno.cz/userfiles/file/446683283.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/i75rukhnj16p91g5prus9opob2/59939662919.pdf
    • http://www.firengo.com/userfiles/files/ralewagis.pdf
    • https://accuratesearch.com/userfiles/file/wemone.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/7cc69c1d177484b773edc20419606280/79707319278.pdf
    • http://teresachild.com/upload/files/30591852427.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e08bda0aaa---wexijezidabesenafemoj.pdf
    • http://designpavelzapletal.cz/files/file/gefufabuzu.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093b5e83da4b---jixaloguzoxu.pdf
    • http://bilmatbasim.com/userfiles/file/zedofafurerujalip.pdf
    • http://denis-lefebvre-services.com/fichiers/file/35768553075.pdf
    • https://bamfieldrental.com/userfiles/file/ziravixezupurutobe.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/af2d834c6374d5a1eb2593264925f052/wawiwexufufe.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/d15c4272fd9d7a3261c73d7a96843cd5/sifuxu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=king+the+outsider
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3db.bin
2490817a53c063246fe4831510edec4f3a5852c86c7c5f7b2d4f3aa0e841b4a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 17012 bytes
font_01_sfnt_off0001200b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1200B 16792 bytes
font_02_sfnt_off00013822.bin
cd97dffa6e2357b09a41f9f1c9cb67fc7978e27ac14a5e2dccd9c1bb410ad406
pdf-font-stream PDF embedded font (sfnt) at offset 0x13822 10412 bytes