Malicious PDF — malware analysis report

Static analysis result for SHA-256 3569fa6607ce5c73…

MALICIOUS

PDF

76.7 KB Created: 2021-09-07 09:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f9cb9912eed970a362910cfaa24c7273 SHA-1: 64da965e1892f9734cb71bf35d1f1ac35478e8f3 SHA-256: 3569fa6607ce5c73a6a283f91ac7996c8d9ce8d4fa9288346b726d72f271dfbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, many of which host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f0f03c006---98491291048.pdf In PDF document text
    • http://sugarfree-gelato.com/upload/file/81766480907.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/jekalizasodemarabi.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16120326a77b9e---54288970126.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202106280800035183.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0932d9a51---13167884033.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///12026392797.pdfIn PDF document text
    • https://asiabiru.com/contents//files/86285869374.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608239f862172---balupof.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/97131997792.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/6e32234e4466fec89c7194e1c4565431/remafipa.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ikld4rv26as9p2kl9e4qvuoo48/3453744073.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/ledafo.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e936c390810---3500558607.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/novaruwarokiles.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7990d03003---sikalije.pdfIn PDF document text
    • https://deepex.hu/hirek/files/34887197373.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16090af176f224---gaxagavifebibakorefabeveg.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/f18484b9bf56ec0bf0cdc03285ac28b3/lagepose.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/6e7c2709e26270cccab5cda62b4a2a93/zezip.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/tedokaf.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/varaza.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/4531700694.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ca678b937e7---nujaberi.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/4855883525.pdfIn PDF document text
    • http://birminghamseaholmclass63.com/clients/75362/File/21910958841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ratios+and+proportions+worksheets+collegePDF 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_off0000c904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC904 11016 bytes
SHA-256: 3ffecc728571506fc03c25781ccb1d1d9cea50e699386892086f895eed9a1731
font_01_sfnt_off0000e272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE272 16776 bytes
SHA-256: 54087676f172f59aca5c4c642bed989d592897f3e583c7eff131ffac035822b5
font_02_sfnt_off00010d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1