Malicious PDF — malware analysis report

Static analysis result for SHA-256 1105f647361e9f8c…

MALICIOUS

PDF

84.5 KB Created: 2021-08-04 21:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9431528fe7efe44d02ab3f2186bf5065 SHA-1: 4cd90cf2eaebeea459b2336e90b406966c2922b0 SHA-256: 1105f647361e9f8cb39af772852b3237472e0cc6d1717bee04d6b60f581ccbfd
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to lead users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3461

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://gloria-eurex.com/45724142848.pdf In PDF document text
    • http://taniaandjohn.com/clients/874109/File/bewivano.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/xaseduse.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608377e1113bb---38599016571.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607780c004cb3---nixabewurirazem.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609844a47ff94---pufube.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d484f0a0c---sevasoteserunu.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/97486179518.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/84457682156.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb724f1deb---zafugopoxagedazudexokepu.pdfIn PDF document text
    • http://solac.nl/app/webroot/files/userfiles/files/5386639920.pdfIn PDF document text
    • http://dgjst.com/upfile/file/97767726272.pdfIn PDF document text
    • http://zlato-stribro-investice.com/upload/files/negad.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/vodewevimojopuvegu.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607377f6b89a6---76728178670.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/resarijobipufogu.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/7f06c4d007332c60fb7602c4bcc0ec71/25735968657.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/gedatatupubepetavasanabop.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/cdbcda0007e1d927565bb4a87bfc2d54/50702028103.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/5k5qrudpimtt2vheqs4go4ng68/57821414356.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/8263e27aea92e7d168ac3f32aa0a1a8c/91407068316.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160927c5e17959---58312921689.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4554dd85ac7710f9c459490378aca1ad/40290850642.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/392902dfca7884143755f5d42622bc71/fiwapej.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/73328075061.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/32929123530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=venmo+won%27t+let+me+sign+up+with+phone+numberPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 10864 bytes
SHA-256: a356899f93fd877abf453ebad6708f6a62d77b37191fe99c89db34a396cf6535
font_01_sfnt_off000111ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CA 17660 bytes
SHA-256: 9b46a71c8d6726a7279dce192e3e7ab18b7f1114117a7f58d2413bdce04936a7