Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e57dcf25ce5299…

MALICIOUS

PDF

74.1 KB Created: 2021-09-06 22:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ead2e698d7a24b9572bc2ca1c86b8705 SHA-1: 5df727f160a5278778e38b8309d0a712f28ab04b SHA-256: 22e57dcf25ce52995248fc7386992862026d427442690140c894b7e5c0ee8290
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the file being identified as a phishing trojan. The numerous external URIs and link farm heuristics support the conclusion that this document is part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/9q6ofs0oou4r4p2ngccest3761/47516866592.pdf In PDF document text
    • http://mbcasc.net/imgs/file/60594100616.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/40303295238.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/a00b39d7e03c2a0d563fa55c5a1493f2/28341870854.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/05honm9d406dcpb6an79i6e9cn/runuviwixujisonusapeb.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/61372524379.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/53723236442.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/zopudezunabodo.pdfIn PDF document text
    • https://aedwea.com/upload/foto/dawobebagaxunorarogex.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/vowuredulunivonapenakevom.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/sizugiromopaterav.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/mudubiloximizamovejexubub.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a80e313b786---xuzokesaxuzujizufasoman.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/73038377430.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083a468658ae---gozamuvut.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/vutisukejakepetej.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/debixololavuzi.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/79677780838.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c89069964---kunaxonativakatasojupuz.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4b35555b7---3262084176.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16094504f3431e---riguworipopilepawisivavo.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/rttn89u6bh610rn5371shso82o/11856405519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=standing+desk+manual+treadmillPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B2 10740 bytes
SHA-256: 2e2b50b210c03249d507c082ac3a4e559784ffbf3a3061e7ae25e6449235a13b
font_02_sfnt_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 17352 bytes
SHA-256: c513b774af21651f3877a0291901689683529c9ecbfdd8ddc0016dccb43496a4

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