Malicious PDF — malware analysis report

Static analysis result for SHA-256 435c5d56db307b4b…

MALICIOUS

PDF

91.1 KB Created: 2021-08-17 00:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 38a5bca5ef812adccb65fb4b1507802b SHA-1: 218614ad5f2b7838b31e6cd054aca945f80cfd25 SHA-256: 435c5d56db307b4bfe3219df9d0ce993a616ca6c2003f8eaa4e5658539b53ea5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external links. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The embedded JavaScript and the link farm structure suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery. The URLs point to compromised WordPress sites and other domains, indicating a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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
  • 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=bose+acoustimass+15+series+2+subwoofer PDF link annotation
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/cff2c2852755e7dda3588b51abe53273/27112837835.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/xisaxurowowibesubusi.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/muxerefemineguwex.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/34100188227.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/662e5fa71b40cb684928f9d500cb7565/modumozinipotinatebegasis.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ecm60f85pm1nois9sf98gk8cg9/45869182787.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/lujamumudimudezijeko.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/17741223373.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/wumozokewoxunumato.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081347f5aa6e---562640532.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4194a6cdb379aba5214051a373568786/pezataradekom.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/wazovefominexogawamevugus.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160798929e6ac7---fikaporowudasotixaxupo.pdfIn PDF document text
    • https://aedwea.com/upload/foto/bakagixotoluve.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fe92ab395ae---wafudusagenavikewoxi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f27dca87843---37127142645.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a625d8b94ef---94347379592.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606cedd3d4edc---13416484710.pdfIn PDF document text
    • https://foulardfotografando.it/file/kakedomadikipoferowa.pdfIn PDF document text
    • http://upbfassadenbau.com/upload/file/96768675618.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a2cdbce48976e81d51de908ad87bd9e3/digakowanikokegupoj.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/51aaa8f6c2b5b327ad56b59ad5482629/61080508049.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/kizifev.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a22cdea4c34---16803671687.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/54669219556.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210530_58439D035B7A6449.pdfIn PDF document text
    • 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_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11141 18456 bytes
SHA-256: b5a90800112e9a8adb9ed3aec6805c53f38c1ea961437fed37854f698daa1249
font_02_sfnt_off0001420a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420A 11032 bytes
SHA-256: d6d60c089da75503d37d28a729f3f72ccb8e45eaf6d1c6f7e79f2187c2720753

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