Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc19da9bc7567d49…

MALICIOUS

PDF

92.1 KB Created: 2021-08-04 04:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a01d66b9d1f114e6a39dee762c0eea37 SHA-1: c368f5a8f0125ebdc2b3e1c189ec547baa63a6f5 SHA-256: fc19da9bc7567d499645cdbda414aefd9d7c1296da94a889adb2d6118c18e256
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The primary attack pattern observed is the use of a PDF as a lure to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://avigailpekelman.com/sites/default/files/file/zawitefuroxo.pdf In PDF document text
    • http://arslanemlak.come/file/pipexavivevimu.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/43862080571.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/22069397819.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/83750625544.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/wegid.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/e21e9bf7d03f4061aa25071bd218d215/57346597215.pdfIn PDF document text
    • http://pmmagic.vn/userfiles/file/rozufixevi.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/nogekusub.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/zozebemetapelakubovipiseb.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/duwitegetokesuketexopa.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d7514b688---30991526113.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b812abc21bf---56324850034.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/vupuwegijuxosegabofab.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/53848924341.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f3301d055---65159679383.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/79946285460.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607632304be8d---zizomutelimuzemugipiw.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/tifam.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/28807134827.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/90888b146b922d5174df145983164b6b/wunitilifapa.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210521031901178.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/96520965f80dd186c7488dea5eec771a/zifenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+affects+the+boiling+pointPDF 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_off00010276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10276 17840 bytes
SHA-256: 2a4b10c511c658861c20e573bb9551fbc36c922b5592ae9117fcc704dd38b6e2
font_01_sfnt_off00013209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13209 10792 bytes
SHA-256: 1392ca36afb13fd0b499c80f1686f953b848b7d8cb68832f027e7c4be0cc7c86
font_02_sfnt_off00014aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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