Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfc179fdfdae22d…

MALICIOUS

PDF

73.1 KB Created: 2021-09-23 02:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53f0dc8d483aa371f85245e4bf706955 SHA-1: d383fabe516686e709ac58ce4854794e17864005 SHA-256: 1bfc179fdfdae22d70cf0be0865b7b5cad26b76772900f4cefff979f37ffdc7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous embedded URLs pointing to various domains, some of which appear to be compromised WordPress upload directories. The primary function seems to be redirecting users to external sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://chcial.ru/uplcv?utm_term=human+brain+evolution+timeline PDF link annotation
    • http://thietbikhachsanvinhhung1.com/upload/files/41519983467.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/16189949609.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/matuxesowisonemogu.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/89106626753.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/digokovova.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/51130476948.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1605db9ce65d06d7ef03d6a647dddf6a/70101019264.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/655498879a38cc12aba6abecef97a158/telero.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/48698094015.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/senunuzofar.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161327e875662c---96786070938.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/67238955506.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/25541257071.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/50175867317.pdfIn PDF document text
    • http://acelybio.com/upload/files/xifuwanabibu.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/48089957275.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/4916118308.pdfIn PDF document text
    • http://ministerium.pt/files/ragonexirowadetoje.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/97749812634.pdfIn PDF document text
    • http://sdds.be/userfiles/file/kujibatajonumumoru.pdfIn PDF document text
    • http://air-ned.com/uploads/files/22381698876.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/xavikidowikoforafineju.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/ninuladizul.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/laledojiwufajexow.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/77488660186.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210912200410468.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_off0000bf15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF15 15844 bytes
SHA-256: ac54da3d43c4c672b41dd9be37a6c4b4fc094e05322418742f392aae0dd898bd
font_01_sfnt_off0000e731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE731 10396 bytes
SHA-256: 45da6c36bcef40761c267fd94004b8aa2412204da4a17037191e6a5e89c6c5db
font_02_sfnt_off0000fea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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