Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd1d1ba907d0b40…

MALICIOUS

PDF

110.2 KB Created: 2021-07-05 02:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 35b259523675760b89666940961fc633 SHA-1: d8d5c35c881ce24bf55a2fd84ef4ec6339271888 SHA-256: dbd1d1ba907d0b40015ae711e80b56d3d88ded8b1cbabe272f3f947a9205a6f8
156 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. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used for phishing or malware distribution. The embedded URLs and the nature of the heuristics strongly suggest the document is intended to lure users to external malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://queure.ru/uplcv?utm_term=alternating+series+convergence+test PDF link annotation
    • http://asijskepotraviny.cz/files/file/83295143818.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/ketoxifuvusotafotovaf.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/del98ojoc9bj9f8l2jdv2mrjm6/kopuxamutoju.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/xebegajojapug.pdfIn PDF document text
    • http://betenrealestate.com/sites/default/files/file/jukuseponufifijukusu.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/96726663362.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/61453002667.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724ceeb649e---81041967252.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/rizenagigawine.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/babarumosemekibudufoji.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a4206452c71---moropimaz.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd96fe25d1---wozipodetazufudevediziw.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/fd0ea90abc06c1074907e9956adc7b91/66687456241.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa7060c6eb---bepinugugimogokim.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a75e012fb2---tawekesujalasep.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c7c59d6ca---nupisodupanigixarogek.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a540c4eef82---fagarij.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/53629069100.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vhoplkhop57btb7s56bdughdu2/37207413743.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/93323431062.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/farapurofukupowo.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/107ngjqvh9ack3d80pjdbc479g/56174779391.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd9dd79dbe---tokodewap.pdfIn PDF document text
    • https://lapdonline.org/file/rebelemubitifisuzerimumo.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_off00014c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C86 10452 bytes
SHA-256: 25016ebbd0daee0a929a7059bf3e0d97bed60120053485b9f19700e4498bde17
font_01_sfnt_off0001646e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1646E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C80 17592 bytes
SHA-256: ab671280a8cfcc5cc85c349f2611fbdc54849f59000a5269751b53e27ce77a81

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