Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c0a6424ff8f34c…

MALICIOUS

PDF

78.9 KB Created: 2021-09-01 06:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6191eab5e32ad826fdec2da89af95766 SHA-1: f9ece0bfb088f2b50a643f9d4decd3771d67170a SHA-256: f1c0a6424ff8f34c2149bd8f367538d940f5e9c69509e741734eb1bebc4f2ad9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://mashtalkandil.com/userfiles/file/5781188573.pdf In PDF document text
    • https://abugfreemind.com/userfiles/file/sapawenigojem.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/e38d0021ee4c97ce1230c52865e74cf8/95648040079.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/kibiguwadibafuziv.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/84169960de728bf9f12755ddf79ef151/sojaviro.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779ce0bd51f---fiwazaxexakadezijiguvajif.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/nijezemeganeve.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/cmjla695bfd6st3oogru8u7722/zikili.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608239197d26f---31081601626.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/c4ba047e5205b8a1757c755681b93135/dajafuzekokosowisofiki.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/76d9dc70d7ef7b440b3e26a59a28f7d8/fakedonimegekugafaluj.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/modoporewufotekidolenanog.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/98603971153.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/kepixakunawesapekuvefavi.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/nuzivaniwuteragebexinu.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/1848647548.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6be8a7795---41402084647.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/33931348389.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3102f559c8f7a9357d0f4faeab36ad3/zolige.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b147dd60ffc---wunaregufaporujan.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/75560dbba87ccd4d31ae4853923f1680/48750578306.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/70917046220.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/rerejali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=twitch+leecher+androidPDF 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_off0000cfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCD 18112 bytes
SHA-256: f3e1e0cb48bee7a85cd657409e1bdb662ad4b17542145acbfdba569a084dfff9
font_01_sfnt_off0000fe00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11617 10348 bytes
SHA-256: 3af71f8d2b65eacf46c3a28922fea6e572a20e838d6aad470d7d8adb3a566fd5

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