Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc58d18f4126777…

MALICIOUS

PDF

85.9 KB Created: 2021-09-01 16:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd990c4c695838ddcea4cc9766c186b0 SHA-1: f3e7470ccacd459e757d2f8f41e0bbbde1405b9b SHA-256: cdc58d18f41267775cd361f6fd0b485da1868e607c1aeb4160c9616398afa0d8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm is a common tactic for directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9643

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://philabc.ru/uplcv?utm_term=pirates+of+the+caribbean+9+pirate+lords PDF link annotation
    • https://acgroupenterprise.com/userfiles/file/50110291368.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/loxorenunozer.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/79431850737.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/vofqc5p7um1ftsrqnh9ak2pbf0/87814743648.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f6cd4a8f2---43313383400.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/kinilivokajasegavare.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/60154626869.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/muromezefonazefo.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/larajewije.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/xujowidoxazepe.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/38e5a047d06d2e660776c535908d40c0/3060100437.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/10445575998.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/buziguwujewipenosa.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/mugifejivesaz.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609138ad5ed07---tokumawubu.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/72695904359.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/40239804186.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/khv33s1pcec3cjr0as7h41cer1/zibalizovovogajutofovafu.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/85004e25a1bf8f9c9c417637ee535746/dilovufopidobidifage.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/81404397847.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4ff20682bd31dfae949c11a33b74aa88/xefimafeliza.pdfIn 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_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 18992 bytes
SHA-256: f762d3b387355f5afa89be7f0f51862204651e801feba2c0aae3b3d29e3cc16d
font_01_sfnt_off0001203b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13852 11024 bytes
SHA-256: 59bd3945cee5f9bfb6ef7d3ad6474ac65f14525982faf88e294e8e975ee224a9