Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c447adc45e6a4e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-16 23:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cfc982cfff7883475968792ae12edab SHA-1: 34482833130cbc02604ed079b61328e9f5b920ee SHA-256: 89c447adc45e6a4e24e803bdbe038b9b3d9ef96bd78a65102aeebd3c6e072155
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chapraptti.org/userfiles/file/84856617447.pdf
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/xabox.pdf
    • http://psycare-spb.com/userfiles/file/58763346725.pdf
    • http://topup-fight.com/ckfinder/userfiles/files/38116298767.pdf
    • https://goacetours.com/ckfinder/userfiles/files/35487380420.pdf
    • http://delfosventures.net/userfiles/files/75740470684.pdf
    • https://www.disbel.es/ckfinder/userfiles/files/86292695270.pdf
    • http://mishelik.ru/userfiles/file/xavaporosajudadisuja.pdf
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/gogafebazarepexidud.pdf
    • http://spokoino.ru/i/upload/files/xiwufajasokisa.pdf
    • http://balcimimarlik.com/resimler/files/jofafopirojenuremamol.pdf
    • http://knipia.com/userfiles/file/2733556376.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/d62ba7b17bedd29ec094492a3ea60a8e/puxotifizufudebirado.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d15663f2a6---21691598980.pdf
    • https://myphi.biz/nbloom/fckuploads/file/32725493779.pdf
    • http://ksklinika.ru/ckfinder/userfiles/files/dixigabuxefav.pdf
    • http://modulobase.com/userfiles/file/zijorotuduronukomudine.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161307e09b7965---58126551571.pdf
    • http://a-kamen.com/userfiles/file/wovipofavopanupopudise.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a34992414c---68531096970.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/64720824815.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/jabuzawos.pdf
    • http://metall-press.ru/files/68441719293.pdf
    • http://inannamsao.com/uploads/files/10002014604.pdf
    • http://tms-technology.com/ckfinder/userfiles/files/zijudonikider.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=saawariya+full+movie+download+bluray
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e83d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE83D 16792 bytes
font_01_sfnt_off0001004f.bin
7edd18aa589f8170a6ea05d14e687ad2088b9f3162f833e817deb5c0bce6cb22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 17256 bytes
font_02_sfnt_off00012d12.bin
f78a80ad07320fa92287a9bc2ead0fe1f9ef234454696023294549f82d499884		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D12 10832 bytes

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