Malicious PDF — malware analysis report

Static analysis result for SHA-256 7377bdc0413fe84a…

MALICIOUS

PDF

97.3 KB Created: 2021-07-06 06:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee9fa479d6660f2373195199abc214d6 SHA-1: 45ed942038004d5306e5d2cbf3bb3a43f0177a26 SHA-256: 7377bdc0413fe84ac4f59c73c75cbc85989073b99c3d378de79a65b8bf829ace
176 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of external URIs and compromised CMS upload links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c98cb305777---78573689629.pdf
    • http://ceramicaartisticamarsalese.it/userfiles/files/85012666925.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f9f325aaf---givanorizubowodenalojobu.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9dfd87198---15246616888.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5c3h02naa9sqii5pliv3uhhvm7/befuvumumofemol.pdf
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/mebovizidapifa.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/k086prd2r75109cfr4kfu3e9av/fomoduzomebijawarup.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/jilononavax.pdf
    • http://tradeweb.es/userfiles/file/pemenizipomavomeji.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e6031619f---tikimomekomepiguwokubo.pdf
    • http://ledseoul.com/userData/board/file/koxasumiwisoguwi.pdf
    • http://oreade-breche.fr/userfiles/file/muxabitevegumu.pdf
    • https://airbays.com/userfiles/file/36312167538.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b36fab38dcc---robibukiderijefolutodeli.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608db273c6224---71989018197.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ca50e787c5fffc7a5fc37592445820da/bijewajag.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdef6f387c---35809063859.pdf
    • http://gildiamasterov.ru/userfiles/file/33238266847.pdf
    • http://richmediahouse.com/admin/uploads/file/dozomojop.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/a5af668468b06754b3d4287b3999e40f/43745820099.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb7b4ebcd1---fegapuvenitixavuvazi.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/614c9e9c1034cf29ca842b495e737e33/84767603280.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/46334dc5db9615d5ac4e6394489692d6/89808160887.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa0136478---finenariroruninaki.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb8078f828---poliwuw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+does+dora+mean+in+spanish
    • 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_off00010e5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5A 16792 bytes
font_01_sfnt_off0001266c.bin
0bd4dad2e2c89aa489c8b50204e92d082573895632081a559c082c978f2b07b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1266C 22716 bytes
font_02_sfnt_off00015e76.bin
572a349a3fa3c55e8d4c5c4205669b24b0fd3d6ec6493a6dffb9bccfde2aca63
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E76 10604 bytes