Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc7978181b1674a…

MALICIOUS

PDF

76.0 KB Created: 2021-09-19 06:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a4501f2097823150a2a1aca742107928 SHA-1: f2cff1257ab612fd517e878999a17cf025e0983d SHA-256: 3bc7978181b1674afdbc909549c4a6fe2fa70e0ba0bb6f435fc682a2873cc2a3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://allefrgycg.news-read.com/upload/files/81752111000.pdf In PDF document text
    • https://onlinendttraining.com/files/68596757815.pdfIn PDF document text
    • https://cooperspick.com/files/ronipabumip.pdfIn PDF document text
    • http://arucax.am/user_images/file/dubakujolumixegawez.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/393ac7da7e500ee6a7ecc3a543bf7e2a/xaxabepanafigovuligixud.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613919380edc3---pawuvivo.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/31150433888.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/18760112562.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/1668915500.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/rikilonuzadamimipikafi.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/zulidejunut.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/23720102020.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/lugewonuti.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/pubeximuroganoja.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/lasatofutalufeduwug.pdfIn PDF document text
    • https://penzehir.com/dorceiys/ckfinder/userfiles/files/topoxorazu.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/855572081a0f556dea8b52cab7c98d7e/soxumavarodupolozoki.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210904045027.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb93979c81---46526116460.pdfIn PDF document text
    • https://kiptep.ru/file/22760339443.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/15874962345.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/godoguf.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/32370330836.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/zituranuruxexupuvilid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fish+mania+mod+apkPDF 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_off0000c51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51A 18204 bytes
SHA-256: b83d7578ea90e070e5a7db58156e61d9f0601dbf4d09629df500ede0c5e8f623
font_01_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 10348 bytes
SHA-256: 9b40103b4de058ad772ee551f49028405fe4805f6cdb3aff28b555d8566584c3
font_02_sfnt_off00010aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1