Malicious PDF — malware analysis report

Static analysis result for SHA-256 e34a92bada9f56a7…

MALICIOUS

PDF

85.0 KB Created: 2021-09-15 16:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 27fed8c6bf667a0148766cea9261b56f SHA-1: 43171532b9bc6239e26cb18af2cb447a0d28cc5a SHA-256: e34a92bada9f56a7d7b9952dcb661f1d8e941c3dd5b8867e7f12e3e8a0dd9b40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings suggests a tactic to obscure the true destination of the links, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=pairing+airpods+with+firestick PDF link annotation
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/butolazozibu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/muwamubevexe.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/74571369789.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/zitixidinusovodobawopum.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/wifugunon.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/tuseminojuduwalimufa.pdfIn PDF document text
    • https://onwater.my/uploads/file/75711980933.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/tapabuziwomagavetotoguwo.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613492d966c5e---bikifefivatibonutamuro.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/petifijub.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/sogofaj.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140af98ae259---xuvasulebugowoze.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3f300e330---97695280489.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/46744392777.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/73066652644.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/c4a88bf0f7f2753ff320355b1bb95b30/luvafemefuriri.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/wasoz.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4e28ea76a---47057064540.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/dutabo.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-2/20210902233531229408.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613745b6431c5---wozukipuluxazip.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d6de289c8---kaxaxejototub.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/jegemuxumaxosawewopinewu.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/bekujolopimasum.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c87b1c3ae37d7b99defeb7b1426b4c3b/21211978062.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_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 17688 bytes
SHA-256: 65b44a685ae4b6e437f9d999def1f2418cc97fac0d3616fdcfdec4101f9bf2d0
font_01_sfnt_off00011458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6F 11032 bytes
SHA-256: 10574cb958161fb89e8faf477bbcfc6d06c3d36b7d37978682d96cac413da6a6

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