Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07ce8b4faad1b32…

MALICIOUS

PDF

84.8 KB Created: 2021-09-03 02:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d4ba8e0e82aef9390d0cc2ba56456b3f SHA-1: 4708b6719742f4c74d451d75ecb0e05260d112b6 SHA-256: b07ce8b4faad1b323ba3dfab411e896750db462665c0acb7eedc3c97dee8335a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d025f42bdf9b7d1c0013ed333180b54d/71270982431.pdf In PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/98269739959.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/bb303e649f17f4f233673fab57668d8f/94117315055.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/47758390431.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/11281996157.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/vuipmclbuei4sqgs6sb97v8150/87150246624.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612bac271dbbc---fomofagekojubetir.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb48b335dac---95225855623.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/ceb2a042645aee789ae74205d626f4ab/18507010578.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/97843d2cacf5ed9a9243e41807c73400/vinavomapar.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873ed8c3bec---88600589799.pdfIn PDF document text
    • http://schokobrunnen.com/idata/95989243448.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/45224303909.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6be7be4d10e484f1009baee74e3f0fc7/42824740931.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/32575152262.pdfIn PDF document text
    • https://littlelightnepal.org/userfiles/file/91387551044.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610676be4b588---42072288077.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/xavinilin.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/33537796731.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cbcurh99d9obrke7ohc6o4ej76/77154885360.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e693a02e8e---90058253421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+reader+by+bernhard+schlink+pdfPDF 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_off0000e47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47E 18920 bytes
SHA-256: 9229b588c55821d6c748a9015f2b5b575574fb5edba08b0be619402eecc86f00
font_01_sfnt_off00011518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11518 10808 bytes
SHA-256: 38899606a61be05645c27a359e02fcd77e809cb9c838bb4df32a834578825f94
font_02_sfnt_off00012dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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