Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01fc8422caa981c…

MALICIOUS

PDF

181.9 KB Created: 2021-08-25 04:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 623b4ab1f6126fd17d8874d00b537bfe SHA-1: 7ab797461528394fcacfea41b2398a3934705ff9 SHA-256: b01fc8422caa981c1b3f4e05096214bdd9b3fe10dc811f3fc7d4c8164c79475a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting an attempt to distribute further malicious content. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://laborke.ru/uplcv?utm_term=bacterial+classification+pdf PDF link annotation
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16109fa303dd9b---situkulo.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fafc95eba2---97460034355.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/davaxotam.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/digakogufonujaxada.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/sutarobuteted.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/sukapinaroxizifexiwo.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/e28bjjd8i7oublrhedr87uddc3/68831854925.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/lowenenoxofarilagozobedo.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210601025827.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608f24661f95f---gepibubawilekinalosigeke.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/vesoweropigex.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gmot01vr05ggelnchmsj9po790/4015126442.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c568ef576a4---83653078084.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/fizipuvafututixem.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/8trd2ai11hhmfelav9g057e2r7/13395579309.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/1g6sb6gtt2uiuq1e42j3dgcpp4/85365743156.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607295c9a2626---tipafibowor.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f8b332982---47694338717.pdfIn PDF document text
    • http://erpos.sk/data/files/98644412001.pdfIn PDF document text
    • http://teplospectr.ru/images/files/xesir.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/02b54fee9ae352415d727e47a4885fda/vowoxotonuzewitupi.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/f13c7f5fc930cf831b7c3a60a4f3996f/49869546725.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/2e6ce765af4f5f4964038881c0b72870/zufegunajojagudisawoduf.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611b48bdb4883---1284345249.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/zefusedebej.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_off00025fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25FCD 22236 bytes
SHA-256: b26255a212d4ada1c035291295a6b56aba6bbd722ed7c5cc83214d6d6267c421
font_01_sfnt_off000297f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x297F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002b00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B00E 10668 bytes
SHA-256: 78c39c6d5ff30e05a9f812cb35c88e568029a1941ce6204d726eaabe909335de

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