Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e51899fc302076b…

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 07:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d2c2a957bef88277f1c2f9fa1384ab7 SHA-1: f1ae4f9044ed975be5590d48689fa1fbbc8ce817 SHA-256: 9e51899fc302076bbe9251da363498e0391fd5463b1c40dcbe535522e9b01687
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload locations. The embedded URLs, such as http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160886d2fe5514---46203127938.pdf, are likely used to host or redirect to malicious content.

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 http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160886d2fe5514---46203127938.pdf In PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160949dbf06f7b---tozedezakafozifuw.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeb9891704---52485122249.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/e5fe028694362fc69615a41abf35c4fc/jipuzivako.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c88424916---zijimazunuzobifefudukop.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607570aa27e24---nezigibumumiwijivi.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/d16b12bdd7011de1ab2bfd3a842298ad/83195721868.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/71106957784.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/loxexagumuxiz.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/ximenexusur.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/37382456060.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/bogupujopofalok.pdfIn PDF document text
    • http://halaljones.com/uploads/files/5718008268.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/59939140577.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa17e9eca---riviv.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/diguwojuxabupa.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/wamirisumaketixa.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/j558ppstciq9oco8kput40teu4/45225891995.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/64800347004.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/mi2nc4bssagn3aplvelpp53d30/79373147304.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/gefojunonaneditonusogoji.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/feripaxaronevol.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210808084828.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/73434410236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=april+month+current+affairs+2019+in+tamil+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_off0000b7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BC 19036 bytes
SHA-256: 5f23f4e045f8f7fd4356e1e7fcf72e776ad490421a2858e7c7e38f44247c79e3
font_01_sfnt_off0000e617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2E 11428 bytes
SHA-256: 2e5c457d3b14ad918ffa06418ab59e9108a4f852921a642f5907703bd51a2eb1