Malicious PDF — malware analysis report

Static analysis result for SHA-256 3edb15587d80fe1f…

MALICIOUS

PDF

68.8 KB Created: 2021-05-14 05:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2d6fc429a2367526b697ac0911fc5700 SHA-1: c2ea8d1f92e2285d63359df256435d948610e954 SHA-256: 3edb15587d80fe1fc4ecb3b19077f505f4eda749b89f78eb83c5a2cfdc4f703d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=calculator+vault+for+photo+mod+apk PDF link annotation
    • http://banglatalkies.com/dynamic-images/cms/file/jomopukakosivuju.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/smrr91jj37fpgrcb6pc913djo0/futaxofugumutorujixikofe.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/2tbn6idsir68ar4488jonsba7g/44445070902.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/cc4d111b4c844903106d933720c1f424/44432244016.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/rozibewo.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f6f1409d2653278bc61eb0659a916a08/70174228570.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f8c98bb3f---79366578787.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16094272e350dd---2206114457.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/68081241749.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609990776babe---59099088211.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/zijoginegewefemuva.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/vdsp6dfkkn03jmm43ne6tekkoi/66067139676.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/jolurogixujipuvemet.pdfIn PDF document text
    • http://bjallstar.com/upload/file/72093702215.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD203 5248 bytes
SHA-256: a9b98996958455649e04d2fa0d483998dcb346f4db89f17c6255d1f09ed98015
font_01_sfnt_off0000e3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B9 11108 bytes
SHA-256: cf81c31686965a623c642d105d6da6beb0f8fcbc74442c32c06578fde60c5423

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