Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc4dcf1d9510dab…

MALICIOUS

PDF

115.7 KB Created: 2021-07-04 02:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1673f51a927fd8e64ed822bfd941aacb SHA-1: e904ac15c194260d7f0d243e60b4a9530d1f1777 SHA-256: 2bc4dcf1d9510dabe678116bc7865c7a6cd2c8613f62efe02cf4684c77ab4e45
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and link farms hosted on disposable domains, indicating an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it's designed to conceal its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=lachesis+200+for+eye+floaters PDF link annotation
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/fajokuk.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/nemavifekisora.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/99664317024.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16080e81d204cd---31792643289.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/60054580009.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082964b4dd8e---92868464151.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec711a94b1---zuvakabosarajejubekisu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/40945693904.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ed1090ed---sumive.pdfIn PDF document text
    • https://amblamy.ee/upload/file/13036493042.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/684ba5ec5b57881a96a8a3c853c97668/mekawo.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/u9ebb8rk77f8jf6irdq3sahvp5/29874985386.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4d950f617---kefivobewisule.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/sbt0lk1p1pg4uui4h1coe3gr5g/56122932712.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f96c0c76e18d0229fdcb8bc4f144d77c/xakuwesovole.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/9o5dn1077niepj9e96i3q73tsi/53930538885.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210530155841.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8968cb7a91---vizefesusewumiwabogakivi.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16072a27d58de2---39230749629.pdfIn PDF document text
    • http://upbfassadenbau.com/upload/file/sirelewunud.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///vatixofuwoxodulemakar.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607540be350e3---70965380679.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776246af003---mozurumogored.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_off000163b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BCA 10640 bytes
SHA-256: 9f0660e669b04edf21ffa393e1f47001935060eb8189f9fe7f67be2dae98c0fc
font_02_sfnt_off00019464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19464 16756 bytes
SHA-256: 7ecfa9b1a6f88d753f90bb69e8a40e62527f827433992bee9deabe9efc06652e

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