Malicious PDF — malware analysis report

Static analysis result for SHA-256 585f9c0f0d392547…

MALICIOUS

PDF

90.7 KB Created: 2021-07-08 04:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7509b280f07cb6e6ca14d98034bf4006 SHA-1: 03f5936d6f28e0c6917759e1bc1c2ff512689b56 SHA-256: 585f9c0f0d3925477fd49bbe1725daaf92a4efe949bd87f512c5d02bc06f06b4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to potentially compromised WordPress sites, suggesting an attempt to deliver a secondary payload. The heuristic firings indicate a link farm designed to trick users into downloading a file, likely a phishing lure. The ClamAV detection as Pdf.Phishing.Trojan further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=government+information+center
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/ac5833de6d9b6370583c12b4bfcc706c/xitut.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609509fa7bb01---29946114815.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a38ff15d1ed---66406782324.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb1fae8c8b---kenufizeresadelupibakinod.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f56fc6dc5a094d311b1fbfd9ed06dfa8/bisowadawebasikegilebik.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971b5778b00---71695717214.pdf
    • http://gunjanjain.com/app/webroot/js/uploads/files/tujixigasovanib.pdf
    • https://amatnieks.com/pictures/image/14643667498.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08f479ba5f---roludoriximixe.pdf
    • https://alixdemassy.fr/userfiles/file/44258794102.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4034b2ceb0---55399651741.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c379636ade4---38063987522.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16084f6303580f---63062802841.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160747dd9cb7a5---mibaxizakinit.pdf
    • http://auxerretv.com/content/public/file/1443909439.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c8rjvl0bd0tdj4b34q4dqiekq/radugasaj.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/ga12736ddrjbhbeoj96il687lt/kumibesutijug.pdf
    • https://maggies-handmade.com/UserFiles/files/befiloxowuximijoz.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85582957b0---33192087063.pdf
    • http://www.rpv-drachten.nl/files/file/52795875267.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/5e428fl8vbvhuutpp31jnlmb7l/jojasizumexafomika.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/2par1qf3e6boflkoo49jh0qtg9/28508016566.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dad2e6451---fevoxolumixadajoxejotij.pdf
    • http://igorodstore.ru/files/userfiles/files/tarejeve.pdf
    • http://guyfamilyreunion.com/clients/41950/File/pofovigogujexotuver.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe19.bin
219f18af363eddb4e4770da6ee8a451f65546ee80394980e8224027bd8633d96
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE19 10388 bytes
font_01_sfnt_off000115a2.bin
1b6832cb28e2ad67e7ae3040885773e4a04770f04bba1b7889392d3167ac32c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x115A2 18236 bytes
font_02_sfnt_off0001458d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1458D 16792 bytes