Malicious PDF — malware analysis report

Static analysis result for SHA-256 149f9b96364cdd63…

MALICIOUS

PDF

88.1 KB Created: 2021-06-28 02:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b3d69545971edae86f9afb183405f724 SHA-1: 078f1e825b61c0269e5588a978f73249e44a0567 SHA-256: 149f9b96364cdd63d521c4c2c510f53f6d9e3c6af8b68638fb9f3e9c5b1f13a4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, which are likely used to redirect users to malicious content. The document's structure and the nature of the URLs suggest it functions as a link farm to facilitate phishing attacks or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/t3tune5n7g0c55tisor1m7988j/13142696175.pdf In PDF document text
    • http://bitite.lv/media/txt/122/file/34373210223.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ef6eff6019a75ab8ac8563973cd3e81b/vetuwejuwopemoz.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/tegugaxa.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/4cbffeec6162040265263d2c7b65a7ab/lalesekemotoxum.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607476f0bafbd---64444940560.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/d81ca856a5cc5102fa14b161f77547a9/jofomatusaxile.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd42f7512f---mifobanegojoxi.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/fowolosorisowepomewifazu.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/66408849421.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/be830300b8742c33018ae0775910da3e/xizituxa.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/78243508639.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989b8fb3382---xenelufapusopopogu.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/410a7570a655cf3b5255a41ae9a26821/11126651471.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/nogogisopajozigij.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c559f9deaf4---19387281134.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5b11bd330---91362631710.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/d2129ece56eb06ec0ca28585eba146ae/64409705669.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160754f482ed17---kisexojivikezufov.pdfIn PDF document text
    • https://soltendance.com/stockages/files/rokuvomalolerubemajakusi.pdfIn PDF document text
    • http://edgecs.net/documents/25588928807.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16092b4363f3d0---1875398251.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608614a152279---wolezu.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e953d2edd5---34636612638.pdfIn PDF document text
    • https://digireg.pl/upload/16658996553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=white+fragility+in+actionPDF 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_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 16880 bytes
SHA-256: aa57030dcfe3af359de3044015151074dc43dafc0f90f276dc3dabed3b1ccd6e
font_01_sfnt_off00012317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2E 10556 bytes
SHA-256: 3bafd3fda399f8b6ca5a4653a9d00d257b7ab7b0bf65f2a6fe4d29d24a7ef36d