Malicious PDF — malware analysis report

Static analysis result for SHA-256 4769c3cc7d5df9ba…

MALICIOUS

PDF

83.5 KB Created: 2021-07-25 22:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15ef5468993d7f38cc4044069eb28e07 SHA-1: f3e947cfe3c5d23deeb17a70a02ce348ceaad272 SHA-256: 4769c3cc7d5df9ba836d8bd2e8d6b13156187b607f52ce495643910ad85485df
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/71906173016.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd1ac2f22b---73531727324.pdf
    • http://kcde.kr/userfiles/file/zasubevuwa.pdf
    • http://paitoonbox.com/userfiles/files/moledojavutefotoviri.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3f0492dc234c98d1feebd318bffaf3fc/gapodusojokezegewowa.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e57bcf17e---2666569309.pdf
    • http://banghetretruc.com/media/ftp/file/32249006489.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160783a6c543d0---dowupoluwizaji.pdf
    • http://adhdesign.de/userContent/files/20210717165214-47121139358.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16081fe701ee0f---8195631595.pdf
    • http://dribblebar.pl/userfiles/file/kokeliwilanevizadez.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16085291439d8c---45276533364.pdf
    • https://kawanmto.info/contents//files/repavabifijaf.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/6d56e039cdcd3aca97ac29eae7a9029d/64090274980.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/04ce01357b405d6a0406b5ee3480f6cc/kutelijijofenemesef.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b7d80aa55---kukifiza.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a97986d85---40540445330.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/wopibidoluzareli.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef93e80176---19413679192.pdf
    • http://clubselectionvoyages.com/images/file/wiferuvukidubo.pdf
    • https://boumqueur-edition.com/upload/fckeditor/file/zodepagemituzop.pdf
    • https://asiarsolutions.com/userfiles/file/14381716981.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c55035f1161---34365277835.pdf
    • http://tamker.hu/userfiles/file/nomijosukezidiziwa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=xforce+keygen+autocad+2015+32+bit+free+download+for+windows+7
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dec2.bin
d268b6a747dc75cda5bef2ac7153f928cd53065d56cad147c8df874ad05e8b99
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC2 16752 bytes
font_01_sfnt_off00010a52.bin
bdeb09dac8a742504e5e6c1b3aee232a2f86401d3432bdc75d8e970eb334e2ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 11840 bytes
font_02_sfnt_off000126e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126E0 16792 bytes