Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5be70c981f2a84…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 17:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c6ef26d6d222dfdfc80ac67f7696caa SHA-1: 7e655844928848b53665a4276c9ebfa8e0fe2a79 SHA-256: 3a5be70c981f2a84adeab2a8a67514fabdb42531f79bc3c0be711dcc2186f4e5
156 Risk Score

Malware Insights

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

This PDF sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly suggest the PDF's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=list+of+polyatomic+ions+pdf PDF link annotation
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/bd580ad2072fae1feeaa58eaaebf12be/71115151326.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f76321f08c---15679727528.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/pamixekabanivavamaz.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/zagozevusewijokovugujakax.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f5f751444ee7ad32806202b8084822ae/nalibepuxusadojoxijim.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/edfee69afb0c944cbfd873fdef0748c8/16752980974.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/96022154711.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0b534dbf3---noruzikawenusenevabajiz.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/94727512613.pdfIn PDF document text
    • http://imbirimbir.ru/files/63430765220.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/tufegozigategumedaduwojuz.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/44006320637.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093413672b7f---29102927002.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/67388298721.pdfIn PDF document text
    • http://sdds.be/userfiles/file/disuvugagug.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/detibipobepalo.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad95a283f22---78518169649.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/gotibetevoxiwijijodo.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/ruvuxi.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/lodokogovinu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/9159364274.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/o5v26787ud2ssgbqmk9qpf8qg8/68131587695.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/pixoja.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/dtarfbpucte2eqafa4mqbg1jlt/xawazewiwumekonididolep.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_off0000d2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D7 10620 bytes
SHA-256: 2827e12a35542fd7c7e2550ac6db77e79eae12338ea21cedd67cb1f4239e76c4
font_01_sfnt_off0000eb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 17540 bytes
SHA-256: a536fe4aeaa61ac94c89735a81803ef4171f7cfdc3eeb6030d92c1ae45c03460
font_02_sfnt_off00011839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1