Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf18cb87ea5bd06c…

MALICIOUS

PDF

93.9 KB Created: 2021-08-13 02:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a94ea7506c053a6ca782d6ca12914013 SHA-1: 367a3f023aff5f76dfd7482bccc0fc4879850ca8 SHA-256: cf18cb87ea5bd06c88c467eb82c0d93fc097b4b7a6191dc813b4513c9c15a054
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document's primary purpose is to redirect users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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.
  • 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 https://wastran.ru/uplcv?utm_term=lakhmir+singh+class+10+biology+book+pdf+free+download
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d88c5ea9bab---padasixomok.pdf
    • http://cochu.net/resimler/files/35467832116.pdf
    • https://luathoanghuy.com/uploads/files/vodof.pdf
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/kapinirujugetije.pdf
    • http://srividyaastrology.com/userfiles/file/jifuvazeganer.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2ef0a9c8c2e12c5e87e4c4f42ef1efb7/93464237821.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c24726cc36b---92451596435.pdf
    • http://dainichiji.com/upload_ckr/files/69971443900.pdf
    • https://arichaindia.com/userfiles/file/tapuxoj.pdf
    • http://plafondchauffant.fr//img/user/file/revaneduwanironomutagubex.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb34a93534---76095806060.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/273bec2a717029eb1f578e054f4e7efc/80966485653.pdf
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/sivedosigeravivomuwiwop.pdf
    • http://moon-villa123.com/CKEdit/upload/files/pavitoneselunesetabodo.pdf
    • http://dotacjedlaoze.pl/userfiles/file/bolugowijojozokuxa.pdf
    • http://sonarkella.com/userfiles/file/83812003610.pdf
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jajoweweg.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/d06d95db2961b6866bfd5994945da6cb/nasulowoxadepem.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/kisixezixokixewasazev.pdf
    • http://tznjl.com/userfiles/files/939779640.pdf
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/7e75fc217d8ea700343feceab1d26817/pibotudifadotog.pdf
    • http://deleersnijder-bocaege.be/images/file/nesazete.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb50a4c883---99125447908.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/n65tb8ckt6rmvvn13vgg8ockmc/26220033677.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f194.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 16792 bytes
font_01_sfnt_off000109a6.bin
205845ed1c981c8d25c3b1e6247505d7b2dab6e71aa439788f203edd0ab303f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109A6 17000 bytes
font_02_sfnt_off000135f8.bin
c0ce40a0db5da46198e8a330e54b405f016c0121b1c9e2ed55fd47191f7d331c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135F8 16376 bytes
font_03_sfnt_off00014c3b.bin
f2a5732167c85b138d7728a0701568758ada4a22d3e4321588db7383769e5c3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3B 11532 bytes

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