Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44962e392bb83af…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 20:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a539f85f81972c521f8f9b8225ac1343 SHA-1: e8213f522af5a9e919e9a2cf7ba69f290471aefe SHA-256: b44962e392bb83aff77c06409337fecd88a069ba4ab43caf5251e60479147601
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external websites. Several of these links point to compromised CMS upload directories, suggesting a tactic to host malicious content or distribute further malware. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or SEO spam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://archism.ru/uplcv?utm_term=height+and+weight+percentile+boy+calculator PDF link annotation
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/9su1p02bt8vdcb5j2dqj24icj4/fovema.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/xuxovogumeg.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611994b3a7df8---tolopegixilotisefa.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/64883982041.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/kipomenurixafiwafuvi.pdfIn PDF document text
    • http://santabruna.cl/upload/file/mafazekoraverufi.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210716_5D1A62EEB8C17FEB.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/fupilerisegib.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/60719142995.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a10f2c13e57---xeremira.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/90684452191.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6c409aa7e---titatiteluwilopiziwem.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/94188658300.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/31143451965.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/75784856705.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/98015679633.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/60026844422.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/26252984913.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/79628085669.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609efddee2ba4---4538419732.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f17bda46fe---21040685433.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/64624954411.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbe48d0995---ratetevuxagorukidimamur.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/81202918878.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/2740615200.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608408dc133db---95660362904.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_off0000dadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 17324 bytes
SHA-256: 882cb1e8ceef5633897ca9d9eec88f58d67414b55d847c38719506b0aa8893e7
font_01_sfnt_off000107ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD1 11056 bytes
SHA-256: 8ac1d34e4c913201f0443ed12c7e2b8ebe8bd3322d632369b3f4e58f4e0004ad

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