Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdd57607e194cee…

MALICIOUS

PDF

70.6 KB Created: 2021-09-16 00:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4e68ea0a06162f4de372b38d2e53458 SHA-1: 450b0990f09289efaea2eeb710337c98c27c07e7 SHA-256: efdd57607e194cee4f420feaae905981630bcece48f3f0bb0b9616b874c711eb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a malicious document used as an initial attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://krisoc.ru/uplcv?utm_term=fancy+text+symbols+copy+and+paste PDF link annotation
    • http://okvin.org/userfiles/file/lipofumijamixojajalum.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/39271846691.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/toxim.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/difeporogu.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/rorimazegixa.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210915231530.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/lozak.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/46286654497.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/lixaduxukidafuxabuxawa.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/f56a6c5a6c1aaa10406ee29ae177154d/73847591687.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/99050019861.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3dcab23a4---42133529886.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/92580768787.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/72216728801.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/1953020529.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/726c13cf04f676002705f5175b3d865f/nuvizaxaw.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/lageravejolin.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/pivamixemosot.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/pugubiwulufape.pdfIn PDF document text
    • http://irollee.com/userfiles/file/1491224339.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fbd6444fb---nosoregutejivevajukop.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/jutufafomuroribiba.pdfIn PDF document text
    • http://knauto.com/upload/file///97873062233.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/70206602123.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/85281167098.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_off0000b40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40E 10816 bytes
SHA-256: 2253726884d6df7b26845e5fe73380ee69838b4799b10a5c74aa977b67c5987a
font_01_sfnt_off0000ccd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD4 15488 bytes
SHA-256: 1829cedbee3b42a28cccc689cd59a17cb6c5979ddccb57088798efca6166a670
font_02_sfnt_off0000f43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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