Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefd1d29a400dfbc…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 07:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 003cd268c2dcd8e505e1633fe59b5b7b SHA-1: 9d1c761cd5f5632e869e22bda046df0a8b9ef01f SHA-256: aefd1d29a400dfbc4b0d588cdef817929e76e8f8022222a1c1df1b2d5ca7db01
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, indicating it's a phishing or malware distribution lure. It functions as an image-only document with a hidden clickable action, typical of phishing attempts designed to trick users into clicking through to an external URL. The document contains numerous links to various domains, many of which appear to be compromised CMS uploads, suggesting a link farm strategy to obscure the final destination. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://catamma.ru/uplcv?utm_term=all+of+the+waves+listed+below+are+a+part+of+the+electromagnetic+spectrum+except PDF link annotation
    • https://swagath.co/new/ckfinder/userfiles/files/lafuw.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/gopofutuxa.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/pileremopibav.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/73356809168.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/sorugat.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kupavonunidomubelugasedug.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/6218576126.pdfIn PDF document text
    • http://boldogelet.hu/media/47517035888.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/zigido.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a57e1be8b---5206098523.pdfIn PDF document text
    • http://popmetre.com/news/files/zigidinimopidezusosagub.pdfIn PDF document text
    • http://vanhacollection.com/images/files/25871977534.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4a847020c---petajuto.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132be5970b77---43112901554.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/40461868513.pdfIn PDF document text
    • http://juentai.com/userfiles/files/23244556084.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/64115332748.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/57251305253.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/36571257451.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/kugavikikavukodup.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/rujutatifugibovi.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/94499551892.pdfIn PDF document text
    • http://jsjxh.org/filespath/files/20210921041532.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/nusanutopavosi.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://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_off0000af1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1D 11544 bytes
SHA-256: 05d1bf75416e6511a396567f136234d466fb374341ab3f79941225607aa8e261
font_01_sfnt_off0000c9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 14176 bytes
SHA-256: b8af9b2611338b3b63ab976829c4198b217ba03ede7265af4576dc3205d13e04

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