Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3d25a6802dc0ee…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 09:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55a09e693030008437dbbe1ee7f0c565 SHA-1: 7b5d89631ae5ae85cbfaee9039c16ac4cd030ee2 SHA-256: fa3d25a6802dc0ee73a5950be20dfad13d8207b42e6536dba9433c07a408abd1
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. Heuristics identified it as a link farm hosted on compromised WordPress sites, likely serving as a redirector. The presence of numerous unknown URLs suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16081bd8935eea---30988163838.pdf In PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077648131421---27306816624.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/97177661117.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/72327049121.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///pasarafusavotuxovakugamef.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/70809282837.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/48323333366.pdfIn PDF document text
    • https://dm288.com/slicice/file/39118469477.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/8k1dot17pcr8fin3ffaemu93t2/11922300464.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/lavibobenufuzevebosexom.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/09c86e1da74ea1c916eb7e8db6c9caba/winigazonanek.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/nasakatumukivegesifaweram.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/vudizaxilavo.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b8daf280b1---31998088371.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/afh3fen5mv21d2sg1u7kfl6ki1/33574605708.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1c2ad0a3---bugizojobefadip.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e678645df0ba160942d52d6b3d7d2a50/98263749858.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/41429878777.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/96309602308.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/bexuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=atomic+habits+chaptersPDF 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_off0000dfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 10608 bytes
SHA-256: d5c96c7a2dfdef1c6acef12c6c6a04fd3c4071b36fc64eb30955ec59333da5af
font_01_sfnt_off0000f801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11013 17576 bytes
SHA-256: b01e75c99e227a3bbc83a8209ccf52b3cb5d04d6e28c36a2c4f8e394f572af45