Malicious PDF — malware analysis report

Static analysis result for SHA-256 49130c384073978e…

MALICIOUS

PDF

87.4 KB Created: 2021-09-03 18:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 59e9eec4f2d2ba550f8ef7b89e934bc2 SHA-1: 08ad16d90bba0b7f3e9b52a6537ecf17a1944ee7 SHA-256: 49130c384073978eeec185b1ba5492b3a8e8c5bcc6aa166fa2c0a231010fca97
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://patoman.ro/ckfinder/userfiles/files/mobasagitakifatiru.pdf In PDF document text
    • http://perlawarmii.pl/userfiles/file/56188388142.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/dcd86fqku2b1vunapsuk1rn96r/55025022496.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/631efee4cd88dfdaaa50846c18356a8a/kosakemogozazamomekiteje.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085c8f173df4---xadufus.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/6120a3ba3124205fa17cf876abbc9cac/nawatudolu.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/coihtmaeb9m7n2adhhqv8mqgbd/97989502589.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160beb7ed15dda---filojif.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/kilotetikolilugo.pdfIn PDF document text
    • http://www.shadowrangers.live/img/files/tewik.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/simalefifiwuda.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/u4u3rjclh8o8r269tim544q1rv/59231761620.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/6a3dfaddfc3100cd32b5b2b68ef50c7d/95877433010.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123bb743ea53---95936632574.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/43323465588.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f0733593d0f94aa4ac96d1bb11043f84/xavununerotinatufoda.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/88516603385.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/zivalafinefon.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/a021c8de28a09403befdb1cb3106d870/9355345985.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/tia1lmg9gslrsbdp9b7qgj3sk4/50087394251.pdfIn PDF document text
    • http://abpaluso.com/upload/file/55057659063.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080b0eb8bd6b---jikozunag.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210717/0141242310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pizza+hut+company+profile+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_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 10992 bytes
SHA-256: b4cb896ada84f39dcacb6f062cf5c118ee96c14f3b656caa1a093066ab5fc166
font_01_sfnt_off00010b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0D 17428 bytes
SHA-256: 84439ab36b58b23f7f0cf3156141807a3d4d79ac6ad0ac67f8bf7ef8bb689e6d
font_02_sfnt_off0001386a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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