Malicious PDF — malware analysis report

Static analysis result for SHA-256 88eab0174371d9a6…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 04:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: abd2a8b746eb26a8452e116256384a90 SHA-1: 7c8cf761dd9e4a6e772e5703d4c65beaa9238258 SHA-256: 88eab0174371d9a60a7d62e32b847e5eeaa34fd714e092b4d81932601af55b5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hamzsabegi60szallo.hu/UserFiles/File/tokaxulirabiwopazekote.pdf In PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/719c865dfe198dea3be44d291d443e4d/daturuda.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/woxulajovoferaped.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/gidelelurasivo.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/xufixo.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/91604715081.pdfIn PDF document text
    • http://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/4788344133.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f683e8c5464---84952715648.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/dad33ae66e672e57581caf31689dfa78/lojuzepokuziz.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/zitugule.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/qb6vjgcrvo6132l7v9f0ourqdt/66618003699.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/56645503064.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/dgddhe7p7359aa77m6rpimurh5/49726111853.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/xuxenewazit.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923f3870a1b---97369550095.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/7501f767117f099871de3b550af04254/jazisobogum.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/82880732674.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/pufefekinavab.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/juterajewuzovaxaxufub.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/98545041737.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/79003323798.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d974acea01c---31005410802.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/81094695117.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/11699086167.pdfIn PDF document text
    • http://strap.sk/uploads/file/4101122751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=origami+dinosaur+skeleton+pdfPDF 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_off0000dd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD86 11056 bytes
SHA-256: e2964b6fb626df0e6fbfc0d3e51f0fc47795b910bae0586573d41f2f3f8e4a17
font_01_sfnt_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 19024 bytes
SHA-256: 169a8bc388e78105d5829d2509674220e8eca5907f1bf9489570dae8457fe941
font_02_sfnt_off00012862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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