Malicious PDF — malware analysis report

Static analysis result for SHA-256 e641caad88b5d8d7…

MALICIOUS

PDF

74.8 KB Created: 2021-07-01 17:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b35dcc6491b0fa451f3803cce2c06fb9 SHA-1: 7b361a6be93b09036dc95216fc6f850358c43ba9 SHA-256: e641caad88b5d8d7bf422e569f7d3697e960a943705e30e8d3ab4d7d57060bf8
154 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL targets are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6966

Heuristics 5

  • 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
  • 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://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/urs4j0lkqai2d2qe65sov8uovh/wexajerosudev.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d96d6caaaf---76911260122.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/69823082431.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/5d8cc35505c2c90b28df3571ad82b614/26686093715.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abb8a9a2216---dukirafelanedisetu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/a25d81bppa7p4u59mcjetfncb1/zupof.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16082eebc7fc83---92050392632.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/dbgr0qf1bkloftvc6qf7qrhao8/bisimuruzovepetipen.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6741f056---tokaxepak.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16099b5d36082b---sojezesigikoki.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/830d7a27903510243e99f67243310cca/nadutetijikozitudu.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/sovozowimomesixumeze.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607025876d1ee---dinorekirewamuwitonet.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9ps40vpnebpgho2usd3pe1oa22/29316989657.pdfIn PDF document text
    • http://chinazzjx.com/d/files/88832511311.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/sazuwofovivonek.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/a455f9dc14d4b0d96fbe596812f7b92b/69658002818.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13df2e7d1f---fasomevatezoxino.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/29202911287.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa041393d0---tiwijibapagu.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/67616928929.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16093b0bd589ba---22957007291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+graphic+loftsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 16548 bytes
SHA-256: d1dd8aaac613fb9c6a05e5688b6a6ce4ed2ae07853696ce1c1ff12a6c39ea133
font_01_sfnt_off00010a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1C 10620 bytes
SHA-256: 3065e578b2dd8176cdd66f7fc08c7d68a0fcae35eeee4540e7cadd02b5f35545