Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a675e332b092433…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 09:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 625b2dedd58919ce364a48dc8113fa84 SHA-1: 3e620c301b293749a711b5c3f7f221aa6b4b3809 SHA-256: 1a675e332b09243317ab0c440e80b6f7e07240df6ea31a1895e758a4af628e61
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, directing users to various compromised websites and IP addresses, likely for phishing or malware distribution. The presence of multiple links to WordPress upload directories and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://gemculture.com/userfiles/file/24754839666.pdf In PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/ccfe9d4161356d2a8860346c8a32aeea/20072753264.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f486f53507---davux.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096fdb77f73c---lulifizowi.pdfIn PDF document text
    • https://phukienbep.net/media/files/94929949603.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855e5677b1a---20031873867.pdfPDF link annotation
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/lkm6dhigan9ni7km13dm21vb8c/bodolujikirarak.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/18526811250.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/94168285083.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ce315a679448b08b1a4a182959ee88cf/kakirijodisonoguzaziz.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/30238803888.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/tebabubej.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/58109155705.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dc57eeb2a---4748671606.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/31811158180.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d55d276b8ad8f656892db3584c5332df/27652426537.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7c2a8e560---99038050638.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/e231q343vi75v47bc3cj3dk4q4/91131623145.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dc3749499---supukekawodove.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/famirikajenunotedusew.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/fafupuguzebupula.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/gilogiraterowawebizitiseg.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/21787070059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ambush+the+real+story+of+bonnie+and+clyde+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_off0000d363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 11220 bytes
SHA-256: 0285026f7ebcfca3df84e6508d789ce579a1e08f3625c3c8e0dc44109b990a77
font_02_sfnt_off00010561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10561 17332 bytes
SHA-256: 131bec32d18eea85df8bc79f1eaf1fc6509b6a1d241d0f9045fe2890a9e0318a