Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c990b601478199b…

MALICIOUS

PDF

75.0 KB Created: 2021-09-07 15:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3e87e6bf6946cf2190011467a053fdc4 SHA-1: 9db3eeda9f3b0cb443b1d8ade837675be967d75f SHA-256: 4c990b601478199b561f0889563203132ae900c1d0d9ad9ff40b0fd0b850c883
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://queure.ru/uplcv?utm_term=la+rebelion+de+tupac+amaru+carlos+daniel+valcarcel+pdf PDF link annotation
    • http://kstarsmall.net/userfiles/file///makif.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/sipapemow.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/notomazep.pdfIn PDF document text
    • https://crpm.ch/ck/ckfinder/userfiles/files/24324029124.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb27b6b536a---20402279951.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/zulikurorajupavuwub.pdfIn PDF document text
    • http://headrepublic.pl/images/files/71400773221.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a6d0e754---32678311451.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4d106f12f---powotudakopujasoxo.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052006165870554.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/db2018a995df4ffd0121bf2427cc9a73/sarafavuxexuzudulud.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/42785562869.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/fenizaxixananevibube.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/b9464a51d84f758b413eb9615c287a60/weditenasobexifazapuwa.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/99189224458.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/zogiga.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/5597e46bcc8d8cddbb41a34807265100/85998952595.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fcf32a48d---54167675975.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/56243908992.pdfIn PDF document text
    • http://didopack.com/files/40643288799.pdfIn PDF document text
    • https://istanajp2.com/contents/files/31507005211.pdfIn PDF document text
    • https://triosms.com/userfiles/file/rilunamij.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/8962555918.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/cj6j988i4ugcpdc0r47ehscima/poteresosowoped.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/5606985769.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/53295197954.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8105926811f1e933af1082d0fa13d342/77808840881.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_off0000bfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FE 17276 bytes
SHA-256: 44209458f1f380bb510b366ed12f2b10118bd0510ebe770bed86649c3ba99a91
font_02_sfnt_off000103eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 11044 bytes
SHA-256: ccbb012ae87cb680e33f20480484f0fb930cdb70456aa40d2fd5cb66723e6f4b

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