Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f6d7695c18a4d7…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 05:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dee4f1beb22ef9219220e59a9177e064 SHA-1: 9033f64e6ba2cc39149efb27f4d9255e911d43a1 SHA-256: 12f6d7695c18a4d7dbac648c13b1591bf361e0efb2ba491c2776e1a777ba49ea
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c481c3a6ab3---tebixize.pdf In PDF document text
    • http://www.vegagastro.pl/upload/file/puderabewe.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/42633013821.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5cb3413e8---wunujadipuzeluluvi.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/60271362643.pdfIn PDF document text
    • https://activepymes.com/pub/file/7804642021.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f67e605e956---zelodezejabemitonuvi.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/66889781873.pdfIn PDF document text
    • http://seto.cz/uploads/bewug.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/92386537372.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076c928c05bd---88896999262.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/jimodomutegoxaremege.pdfIn PDF document text
    • https://memoservicesrl.it/file/19016325530.pdfIn PDF document text
    • https://wineart.online/userfiles/file/40160643037.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f521674588---92802041036.pdfIn PDF document text
    • http://caramelitos.sk/files/37397191017.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/toxajonediwuked.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/pfvh7ptcpqu7r8vqb5vavo1562/87308581300.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/17919896764.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/17283328178.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/posukefazivovoparuwo.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/jelodikoxip.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858887994aa---fezejapivegipewokaduboza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=dieta+para+encefalopatia+hepatica+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_off0000d92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92B 10552 bytes
SHA-256: 35d3809fe62b328227e01142931225bb1251b0ac4fa75daf103623fe2d9e811e
font_01_sfnt_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 18984 bytes
SHA-256: 9efec5484f9d54e53561d35ba7130e8e6fbc00338a865d8857d27cae2d463736
font_02_sfnt_off00012157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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