Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4122e4b94cf3275…

MALICIOUS

PDF

97.5 KB Created: 2021-07-23 23:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 10dca6449552ab3d45f5282cb19cf5c2 SHA-1: 3ad6ade9e444b42617e6d47a131f056aba1d5259 SHA-256: b4122e4b94cf327556a426dc70b0ea9415b7c56fb38844fff091e8c8963750d1
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to numerous URLs, many hosted on compromised CMS upload directories or disposable domains. While no scripts were extracted, the structure and URL patterns suggest the PDF is designed to lure users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://ekolojikweb.net/upld/userfiles/file/pewawiwupidelumiwibipu.pdf In PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/c181b9ca5b2caad65cbeb41e67c795b5/wedevusanido.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/85376808972.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/danemiboxopawufefi.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed053a5c9c---gupusezabesirodix.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/pakekuzelubijobiwedi.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4190ef1b97---85633009955.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b574782bd40---debetewi.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/69938821106.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a459ecd320d37bfb6cb86ef5833415ef/21886839188.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac23bb1ef6b---xifasilubukonev.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608544b2ca36f---32421608248.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/wizilagibimadabufavofe.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/vj06hdoqrloi9q0m00k4djm0au/zisijenafuwakirefov.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2fbd58a8---81683591570.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090801f654b7---24632721544.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/dalodirapevi.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607614c358dc0---26456626599.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d1cce4452---25177805353.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/18956249469.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/hb85p14f4otb7hc5ht3nju4jc5/gorur.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/11751539713.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/zinetowokidozav.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/xowukix.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/36498360591.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/damax.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a64f6b25df1---7566773157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=active+and+passive+voice+structure+tablePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001013a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013A 16568 bytes
SHA-256: 2fee8280ed466e75a1be082b7336a308fae9649ce4a6bf1f70a54c1554b7a1b5
font_01_sfnt_off00012c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C45 17312 bytes
SHA-256: 192bf21e64265cb30a5be12b83bf991ae8967d275039eff719ff62fe819aa1de
font_02_sfnt_off0001462b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E42 10796 bytes
SHA-256: fb0cc22743a57893dbd44bb746bed705e468d8c4988eddc2e0bdbdc3588e626e

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