Malicious PDF — malware analysis report

Static analysis result for SHA-256 873e4822de73a5c7…

MALICIOUS

PDF

83.9 KB Created: 2021-09-23 06:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 000cf07f9ab43374d0fd815a4d8cde33 SHA-1: 2f464024dfccda55db22ce7fe6342f494cb15f0e SHA-256: 873e4822de73a5c7e5e9f30a805713f94a7d61cb1f751f8a0114684e77ce2b8c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage and disposable hosting, suggesting it functions as a link farm to redirect users to potentially harmful content. The PDF structure and embedded links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://philabc.ru/uplcv?utm_term=isaimini+drishyam+2 PDF link annotation
    • http://diadiemvui.com/upload/files/zagakudixejetuj.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/zukibafanumadijaj.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/85273913350.pdfIn PDF document text
    • http://8njl.com/userfiles/files/75628606095.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/68602841961.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/19956059027.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/12830057781.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/96464866888.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/13544620156.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/ronovesisovu.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/1df37680e130f23752c9a7c1246c5d49.pdfIn PDF document text
    • https://pindimana.in/uploads/file/sabuzarigasomine.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/71f773c83d519b891f1768892e04b51e/sujitat.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/jedidek.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/regedefawiserixapovekozab.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/95265236502.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/22388298172.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/vrvmao5o5tfslp8o81tdq53213/19292050830.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/titusi.pdfIn PDF document text
    • http://gardatrans.com/content/Files/43761947986.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614105c2b8684---gexoji.pdfIn PDF document text
    • https://pellevah.com/upload/files/tefagiboxitigasoni.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/6711752739.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f001bd74dd32acc9abb65dfce423d39b/kodasarikigagivok.pdfIn PDF document text
    • http://195exim.com/datas/files/60684641857.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/kizodepupisugelaweg.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_off0000db7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 10300 bytes
SHA-256: efdcd637ea8df168b9e923d9eaae542f3d0224ffa7d75256492acee75f728aad
font_02_sfnt_off00010a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 21040 bytes
SHA-256: 297e5991ba5f28c82a938b0144c211e4294c4f4a78e130f065cb9076e844c4a9

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