Malicious PDF — malware analysis report

Static analysis result for SHA-256 589338044e1edfa9…

MALICIOUS

PDF

98.8 KB Created: 2021-07-25 16:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a94297ccda49be261f1f91569fdee81 SHA-1: 2cea69e9d69030940364515bb8587bbb932a6cc5 SHA-256: 589338044e1edfa97d838ae782ca7cda0593004cad87ba97608d6e4d898a5641
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farms on potentially disposable hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://promise-land.com/upload/file/2864483874.pdf In PDF document text
    • http://santeh.md/img/files/16480720953.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a50c8b0d7---judaxe.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/5946195278.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/fe6c5479a943fc64eb84485eb1cf2059/27225590127.pdfIn PDF document text
    • http://otczenacts.com/media/files/pirenitu.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815216b4e77---61825261112.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8ae3682ab---43537742250.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/zupaxe.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084fbdbaf038---magenojupalut.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/52164574643.pdfIn PDF document text
    • http://expresskaliski.info/file/22183510501.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bd64ef86d---fevuxawos.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/40d0eea0da99a5f3c0a53c5bf1ca4c90/28777577366.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/20552704375.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/1637063242.pdfIn PDF document text
    • http://akhsmombasa.com/clients/861898/File/fexiwovanewigimolin.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/a165d204c93e18b78df2d82934eae4cf/mijudiliridegikewu.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160803d82affd2---92252720848.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/bfd52646c2ed7d81e4641a1ba0479aa5/wetuvepipeguwugemi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c219f774311---xamud.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/foduzafobo.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/60040723902.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607d32c31aecb---satemataxovabujenimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+help+the+community+in+quarantinePDF 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_off00011e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E26 17412 bytes
SHA-256: f61af0b28f8e6bcbd3608d78cd0b19e1819ec34abf17b0e625b846805f51d5b1
font_01_sfnt_off00014c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C0C 10908 bytes
SHA-256: 456e732347ab9b05edffd3eb3aeacf7744160811b18097a46d078fb71134845a
font_02_sfnt_off0001651e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1651E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1