Malicious PDF — malware analysis report

Static analysis result for SHA-256 d251ce50374ff679…

MALICIOUS

PDF

91.1 KB Created: 2021-08-07 07:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f62c4a77e07d4f9742ad590fbb52d0b5 SHA-1: 2736b521940816c6300d60129e3df4167865979c SHA-256: d251ce50374ff679e5ee0a5254cc10eb22d240e0aeb2592a20a5470e525f4274
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns suggest it's designed to lure users into clicking links that lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • 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
  • 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://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6a9407277---17260085562.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/53176422574.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/0b59a2f48dd6ad6d708e4539156e0fb9/55600012283.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b127cf6ecd5---6878902597.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/fodemivopopujudixitoxeke.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c223d4f9a3---825124416.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/aab246644b9e771fedea6d8b3c6afa7c/79652096279.pdfIn PDF document text
    • http://hhcreunion.com/clients/4/43/43f38dc94a4d709fe78decf5bd9d7370/File/66719293979.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/22706015534.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/danosoxubadanal.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/5dbb698ad99e88cd7034d07f8561632e/73667591305.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/24796624457.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/65403085555.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae70dab0c4---22723589974.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10237203229.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/22107621636.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/birikibewopoxivupuju.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/1191477617.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b005cc469---24815200200.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7c76e40ad---tasubilexixasijizu.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcb1173715---50090834735.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/dizedomenegesusupubow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=medical+terminology+an+illustrated+guide+8th+edition+%D8%AF%D8%A7%D9%86%D9%84%D9%88%D8%AFPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000fd30.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFD30 25372 bytes
SHA-256: 6a438fdf8adb7d5c871de770f5b611ec723e2c0b183d8191e802c84ea27410e6
font_00_sfnt_off0000c98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98C 11232 bytes
SHA-256: 49f81e2ec053c3710ce6bb6c00f59a617c19721d339d4a3c871d299968b24a6a
font_01_sfnt_off0000e37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37D 17208 bytes
SHA-256: 6be1ed53ed35952afa8cf363273ef0e21d7253fd42250511edb339f001295c9a
font_03_sfnt_off000129cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CD 22380 bytes
SHA-256: 7fe3b0eec4a66bad93a988632e6bfb29c66dd905c7e014f73b7d31482152406b

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