Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf81e94cc88ca4aa…

MALICIOUS

PDF

89.4 KB Created: 2021-07-27 11:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0baa634318dd845fce23f9ba3c5384de SHA-1: 2305ba8adbc736c9413d0da005a61653f8ab7382 SHA-256: bf81e94cc88ca4aabff4c01db49f0e3f915398179844b17f386ee95233b12ea9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristics and URLs suggest a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbadbfc98---79735201606.pdf In PDF document text
    • http://jpind.pl/userfiles/file/68483439155.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45a47be397---rezogukazudeduwamitusuw.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/a8ubp171f5lri1burjn3fkmd94/firel.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b65b114c2f---32370402950.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c125d73f88e---32073081460.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///6015920450.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/jeverawivipufufeg.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210515085204_09mkwp.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609831aab4867---bunabenuruxitejofu.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753b3cba150---92592124382.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/d7be35a16fd11b0fe788361808aacd47/98630148836.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c9be2a5b217e521b83c4ac650746c2ea/vuvavabaxujali.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/96330121354.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/6ad6f142a3333c267ad57408403eeb22/94931482375.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/5309633452.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/fumif.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/9af67a199294c2bf40c284f4d1be8637/74876835562.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/91321626270.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/lisowilopokowezi.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c3221b319---31779918180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=flight+radar+24+gold+apk+modPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 18436 bytes
SHA-256: e8c0f7c5486f34bf9180eeba448fc88cbb20d018cb6c3a9bae498fccc935bb2b
font_02_sfnt_off0001292a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292A 16176 bytes
SHA-256: d4e6f9d1c3c482647bfbb15ad61e93b6b5cbbc63bd1aea10020f41e347ab91b6
font_03_sfnt_off00013edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDD 10700 bytes
SHA-256: c8fe0d9e01fa6407dcd74e73695eb4a13468ba4604029f2278146b344bcbb25e

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