Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd9202436ef60a9…

MALICIOUS

PDF

86.0 KB Created: 2021-08-02 12:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f73e4ccb07030ced34fdf92f1c317090 SHA-1: 2a9bd915c19316f1366a56e244963f4c203f2ca2 SHA-256: 1fd9202436ef60a9bb68bd32f08b186a8a05d0679343ffca373a6f40cbd87c0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It leverages a link farm hosted on compromised websites, including WordPress uploads, to distribute malicious PDFs. The 'utm_term=shipping+label+print+template' parameter in one URL suggests a lure related to shipping, aiming to trick users into downloading the payload. No scripts were extracted, but the PDF structure and URL distribution indicate a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://xn--49s538bo8ux8c.net/userfiles/file/51089697273.pdf In PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1ba84337e---26148824511.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210601112551.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160bdd29d662c1---666626591.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081c6b8106fa---61182868534.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/munetipakobel.pdfIn PDF document text
    • http://ktcz.eu/files/files/49278583396.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7b3d527eb---rebefuvedefiwux.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d1d1ec05392ebeb13ea95cbdb2256e2/89283261393.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edd27e7644---zuranovuxigaxovetisit.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/6mo39p6bsa3aqf609ar31jst24/lafologeruludi.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/vutore.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608e82be4bb83---xenidudivemiwudep.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f9fb08ab---mitajuxutorezigube.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/3ccb3a23d2092bb1f1c5660dc269e907/xizavufalalelulodibikosa.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c952606f5f---lujuxatuko.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c47f230d4---84679057070.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/jobuwozesafuxogew.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/0dc506d0d1ff0faf68413978f49363b9/36882283077.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1621491810.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/kufafevasidadepikozofo.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/jipisekifovujuxowegi.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/98990058099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=shipping+label+print+templatePDF 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_off0000ee6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 10624 bytes
SHA-256: af168975ab4b848081c335851de63bd0e52035a2ec657a27269738e5526cac74
font_01_sfnt_off00010649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 16672 bytes
SHA-256: b370b1c921a7e31e012c1dd040985daa48e9bf1092dedd4072530ef446a55680
font_02_sfnt_off000131ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1