Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9b09e438ada32c…

MALICIOUS

PDF

88.5 KB Created: 2021-07-14 10:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0bac8d3c3d426bcedb64cf890daa3173 SHA-1: 17152eb1d6b4d857a3f1f46d54988629320983e6 SHA-256: ff9b09e438ada32c74d77e35349f53594ec1097ec15b51b3b998695adc3a1414
156 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV, detecting it as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting a lure to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cff1b71c367---2696713378.pdf In PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/4els0mmooq3cesfhhsff5k0sg0/57377502708.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f7d439688---rataxevivuzisemitudutude.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bfc46fddb---47433160616.pdfIn PDF document text
    • http://huiking.cn/uploads/file/052008102780.pdfIn PDF document text
    • http://lulanjina.net/upload/files/20627230675.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/87844742973.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2uoonetq85ha2m22mtoqfu55p4/ravedekikanefarujuvax.pdfIn PDF document text
    • http://www.toptehnik.si/images/dojafapuduruwuxazabarifa.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845dc91ddc5---38453102874.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/puvekovuboxubilewamejo.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607459a2d636b---20066151425.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/lakizo.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/35919545175.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/1f713725c9a199de39e95d8c4687b089/vapiranosemefij.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/61313175098.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/niwoxo.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/29472319018.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/81712230403.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/31e902d9c32f73cce1666be752e668f0/72523775319.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608532359c63f---38184655110.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca02db887---65207144090.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b21a13a535---86855260526.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/6e2175556dd87570c95afbf31a5c7568/89492480555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=all+fired+upPDF 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_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 9920 bytes
SHA-256: 06206fc8727656676b22096cece16f021870a23892c0b97bcce83e6a1971e701
font_01_sfnt_off00011031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12843 16824 bytes
SHA-256: 49136e24af27962cb750b6497d32a2f66416d18677db9e7bb0c949b48fd0bcfd