Malicious PDF — malware analysis report

Static analysis result for SHA-256 327d27c81b845685…

MALICIOUS

PDF

88.9 KB Created: 2021-07-16 11:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2d1e6a88ddb2f47c6c444e30d9e6fe82 SHA-1: 1c05bc929b3d969e13891992a869bcc38aa7dece SHA-256: 327d27c81b8456854a6945563136dbd088201c60fc514ec2b73a81cf80737b13
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs and link farms, with several pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=jolene+by+dolly+parton+and+pentatonix PDF link annotation
    • http://goldenbaycruisesagent.com/userfiles/file/gajinejovevanefemi.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/75876307692.pdfIn PDF document text
    • http://dakmet.pl/upload/ruvalakati.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/8e94d0c310141952676481e70f1e1171/19814085699.pdfIn PDF document text
    • http://chromoink.com/updates/file/fifapabawi.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/54495824695.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/3e3ef526eac8ebf8f6418f382e1f359a/77370945823.pdfIn PDF document text
    • https://synersys.fr/contenu/file/fatizifisiwarezesit.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/j5lkkkocf7o3vo59lirh6ppn43/minogujepusowalomuwasab.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/2f5ecd4443d52c7e1d205818ce6e2362/92406777188.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/86bc9e1aa3157fa8e2ff338a740a8d2f/8886355568.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e12989e58b13543af227f815165dd805/lajufojuteroxodujume.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/45926773863.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/853688914.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/wazomo.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/fivilawidegavej.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce4e714f2e---gofukikanijef.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/1ba18c5b62a574e0df97d6a25e10fadd/49503482854.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/32571737148.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1c78d7df0---xokubaki.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/pesusalugixulowe.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/bgvk774jt1vime21i7d3ule74r/zaxegolibavalitosiv.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/84321872809.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cc224dc26bf---10762552372.pdfIn PDF document text
    • 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_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 10564 bytes
SHA-256: 5a91ff4cf7d8ac90056da657023a6e2000aa3194746ef896f51ff02745d00cde
font_01_sfnt_off000110d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D9 17524 bytes
SHA-256: fa0714974db3b36b3e44dad7b6376baabc71efd86941769d15e7f19b5e18a06e
font_02_sfnt_off00013e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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