Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f2d9fe9e828c5e…

MALICIOUS

PDF

76.6 KB Created: 2021-06-25 16:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6a3dc7b0186f22dae21ab58cb678822 SHA-1: 1576c61df20674ccc9681aa301aaaf55a69d7ce1 SHA-256: 52f2d9fe9e828c5e2db68ed9afe8b1345b034a71b4a3997d31a5cffe16440b59
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/68786970426.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160857c811e6e5---buxunujafexanakole.pdf
    • http://riskhedgetech.com/uploaded/file/43173158760a7f9c4cd438.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c9091b89c0f4b5824c215c1e1efa7b89/80763535011.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/7849b4a566410aa9def6a4176065c8c7/simanarudozokap.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-22/20210522193339200108.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962924eae0f---5764867081.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0d9e1c2f1---52018705522.pdf
    • http://pattersonandoliphantfamily.com/clients/875492/File/87169588503.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c20fb7a305a---piwajawepomilesanowama.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c03d87035---mowek.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed18335f33---73990681568.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ho0mvuvbul14g67mt55lk0rrhp/80935368110.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/4e0a7775e305a5c0258d8d6885b568e1/95957022794.pdf
    • https://timjanen.se/anvandarbilder/53/files/nufoxoxadivet.pdf
    • https://performanshost.com/calisma2/files/uploads/fobabujunokubaxitunuribis.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/7aa5c37e8684de57f5ee5ea3fecc93db/rojer.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/28b0gskum3pt4iokd7lnein8t6/mexakut.pdf
    • https://mvpartners.be/images/uploadedimages/file/33076228340.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=navy+service+uniform+collar+device+placement
    • 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_off0000c90f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC90F 16792 bytes
font_01_sfnt_off0000e126.bin
a6475c1c3b96f944f185598407196c0f732f50f8a18f2a5f1f64d6c0b3703ad1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE126 11040 bytes
font_02_sfnt_off0000fade.bin
a52b5db7314206fc6c2332e4699a92d0429be6722a2b66fe958cd341a8d53b4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 16312 bytes