Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc272f493789c12…

MALICIOUS

PDF

92.0 KB Created: 2021-09-03 20:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c8ee8f42096eb9836f5601a4de3203c3 SHA-1: cad82a045910b3aec3410d7519195f9091bb0142 SHA-256: edc272f493789c125d1b065568ae86d86e5c6f95c90172c9db526dd351d5d50c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised or disposable hosting, suggesting a phishing or redirection scheme. The primary attack pattern involves luring users to external sites via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://recapress.com/ckfinder/userfiles/files/51411485370.pdf In PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c5fc0039b---16556138034.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/83329050133.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/bitutomuvorunodibixubuz.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/79707003787.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/58729313259.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/81093361558.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/0d218b2ab6cb2ad58315633ffd10cbd2/2432305986.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/27669983090.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/56331135836.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/59460309060.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/vubexakujinimow.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/rezezefiwe.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/a7573aaae8636739823a89dadf821a70/35487720525.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/labubogisefubetusunafog.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/wenedubigodowavipuna.pdfIn PDF document text
    • https://network-italia.com/file/81194878441.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/xisapazitunususeluju.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/vairg3j1rcr9re7ugd83ncnfek/72116517794.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/tujan.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/78596267178.pdfIn PDF document text
    • http://retrofotr.cz/files/file/pezateruxagutozavatagote.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/medamubeminezaroz.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a680cdb42d---wizapoxitavev.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/24854453766.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/votidovewil.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/69488825727.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/zasiwup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=le+transport+maritime+en+afrique+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F2 20876 bytes
SHA-256: 03d324901bb00ded1559b886950eacd7bbf8ea63843cfec0132a7bb95737208f
font_01_sfnt_off00012f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F38 10816 bytes
SHA-256: 96ec27e2ad6d4418922a8de8ee53a2c60d87b22439abc3387aed6f7a7422c6d1
font_02_sfnt_off000147e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1