Malicious PDF — malware analysis report

Static analysis result for SHA-256 13059c5b1a9e6ef1…

MALICIOUS

PDF

85.1 KB Created: 2021-09-07 13:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 40b2e6fea8916b8ad33df6312ff4a834 SHA-1: 0425e2621d8137271f0991cf6a209bdd0aee9588 SHA-256: 13059c5b1a9e6ef1f408671c8df7a76167f381d158e8d777dbcfc155c28dcb58
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://karpatskiles.ru/store/files/6974729307.pdf In PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/eg1s3c05c58t7ngvd7iu09b51i/41952030644.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/03c6afc5ed607a76ebef1e515a68e789/4012990857.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/85926421980.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7712d1aa9---muwaxov.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/38519405659.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/pubijedovaj.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/16845398053.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/57172732926.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/62758564413.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-8-19/20210819123825820674.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/xobovizisekinubikinej.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/5686994205.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210624_F57CAC7C9A4DAF59.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b7a493c1d7e---rofas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d25a1f7c0ef---solimugak.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/zerota.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/rigetesigufumoseragu.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ba86a3f96---pomunej.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/jobizekuta.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/867c9d0cdf933668b8d6a5f1c98141e5/buvovozaweloxudo.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/95061346741.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ea7q5in44ml2dun2tgd3qbeusc/nanirerokabib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=patterns+for+college+writing+12th+edition+pdf+download+freePDF 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_off0000e231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE231 11156 bytes
SHA-256: b3dc80c8feff41798cae0d57d2e0af315cb45b77160189c85f52fad60a2d78c8
font_01_sfnt_off0000fc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 18900 bytes
SHA-256: 66e1fafc82a3b4c1841bbfe030888d1cc7da8508be2663e6a6546f7bb5cff0cd
font_02_sfnt_off00012dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1