Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5cf6442bdd61636…

MALICIOUS

PDF

71.8 KB Created: 2021-09-20 04:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6782b462e73c35cb48202d6cd7e5150e SHA-1: 13dc242bc5dcc3b1dff66753abb354e5aaf06f01 SHA-256: f5cf6442bdd616364b466525de7b5b78300b93f6eec556d7df458b044c2dac3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The embedded links suggest an attempt to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161434dc9b2f04---50093022623.pdf In PDF document text
    • http://zgkimsteszew.pl/img/upload/files/90619181854.pdfIn PDF document text
    • http://riviera.az/userfiles/file/53906622898.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/2274907340.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/51440753828.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/62134735104.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/89290746897.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/resifivogegutepofinogon.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/15297970938.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/8k4qg4sl2vn06l4gvraq1ttru0/17588518776.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/naxakevewerep.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210910_BCD7A5345FECADE8.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/lusizewisav.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/rixumodizujizexat.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322504e9aed---zugixorutarikepofugirax.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/21130006920.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/de01adai106t37fvvoh895je5n/libezodawatokowozera.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/mozuxud.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/solalorapumajefunasit.pdfIn PDF document text
    • http://salkim.com/userfiles/file/29548550151.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/25914932503.pdfIn PDF document text
    • http://gptools.net/userfiles/file/14645942123.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/vosipemesizoxolamegon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=benefits+to+drinking+apple+cider+vinegar+before+bedPDF 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_off0000b609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB609 11148 bytes
SHA-256: 1c0857be1d16747184834c871a5cfdc0ccef3f5dd16049ed11c163a59504cbbc
font_01_sfnt_off0000cfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD4 16164 bytes
SHA-256: 7fb770a4d85594ddeb824230d1174d7dc6a158e07bccf562de86d7a8681ae6f5
font_02_sfnt_off0000f953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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