Malicious PDF — malware analysis report

Static analysis result for SHA-256 de08c8dcf1104a71…

MALICIOUS

PDF

88.4 KB Created: 2021-06-24 16:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e12d6fc34ec5d5f7909f8f86d6cbc289 SHA-1: a29f806c2810d4c8fcbbfa772ec3a03de07a80d8 SHA-256: de08c8dcf1104a712379d13283d9c0c5e96c5ed944d101ae2bd2a1af4cb7f17d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm hosted on compromised WordPress sites, designed to redirect users to other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a phishing campaign, potentially using embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa85860613---14727611322.pdf In PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/deganowogikilemaxew.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/xemetabigoxibefiponad.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/68f415d39490d9baa20705e365ae1eca/zupugoti.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6f438e5bc---6590789064.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/rs7h58911cr0q0k5ece06cqiiq/46504045769.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/wawapikidasif.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1c0e3276a---bowatilofakutizufib.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/vogodom.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/dowefagomubogiwekoxofata.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071588005d0b---nomusumaposasubaworadug.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3d566688b---76098309907.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/64575426242.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=icse+books+free+download+pdf+class+9PDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/2778809601.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 5200 bytes
SHA-256: e8af72edf83f76d4c4eadb9371f9ded5d25c8fcead542324a609bdd6badf1354
font_01_sfnt_off00011557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11557 10612 bytes
SHA-256: e4bb96dbd7eeb5f27329345daec157a9d57f59b5531f7f1f4b4dbeb770e8c0af
font_02_sfnt_off0001398c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
font_03_sfnt_off0001478d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478D 2704 bytes
SHA-256: 301b25a1c800571e564dd8343569d726410c81a3633851d420d08300fd17c00e