Malicious PDF — malware analysis report

Static analysis result for SHA-256 f784bac05bcbf5c3…

MALICIOUS

PDF

157.7 KB Created: 2021-08-21 17:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5d81f26bc16421562268795c8fbe8981 SHA-1: e325d9e900305a5d99b59b0dbd576bde02c9de8f SHA-256: f784bac05bcbf5c385384f2277681330119ba77d3a64a80adcec9a071c9cb39a
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing scam, where the user is prompted to call a number for a fake issue. The numerous embedded URLs, many pointing to compromised WordPress sites, likely serve to host or redirect to malicious content or further stages of the attack. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://oniceh.ru/uplcv?utm_term=glencoe+accounting+chapter+10-6+answer+key PDF link annotation
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50b8f12a9---26214690337.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/20182140191.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/74291735670.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c157373dd5---57100078927.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607764bd508ab---37475133619.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160db42161d239---xarijusux.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4325717ece---29627850322.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/jidaro.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/db821989c2e10f2e3262166135b7303c/zewaxeridewifapodimu.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/93360242468.pdfIn PDF document text
    • http://grabnerestriche.at/mujagozevulemese.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/95309780172.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/rasitezubijaxodasimudonov.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/49138142887.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d16970723---28990080012.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3af23e771---92480439294.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/9467068555.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/17225387179.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608eec762d43f---69889467558.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/81076944240.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0edf0a6a9---borejosuralelek.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608612ed79fff---zinofulak.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/29381383294.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/4006586074.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/mutiwojireg.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_off00020124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00021936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21936 19660 bytes
SHA-256: a00a13e00dd3e5a09aa8d33df00b9597c23e7f176778d7d51520b6340d3c3b6e
font_02_sfnt_off00024d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24D35 11460 bytes
SHA-256: 48d5f0ff8cdab89e5c0009872e69f869da34e0e086938994efdf801e2acc35ed

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