Malicious PDF — malware analysis report

Static analysis result for SHA-256 890efe25ce0dab0c…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 23:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e7ba23ee7da1c9c243f596c3d724e49 SHA-1: 450346f1508deb5d4f107051c9ce1abac2b57d69 SHA-256: 890efe25ce0dab0cf9b56c2c26abacb5a4bd88b1a5dde851180e91a9aec6b6b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document's primary purpose is to facilitate access to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=population+of+top+5+countries PDF link annotation
    • https://allora-tour.by/var/upload/file/58237925039.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/30497842020.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/suniligedijirexakij.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/kapaginejanimepujawo.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/losoguwodudasenalimozalap.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/tigira.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/77285773304.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/65391951314.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/75810538174.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/tikobopejibojezirukol.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d477325fb---37240092278.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/mofinowajegif.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/20375044952.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/55151946750.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/17147821736.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/10811207740.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/83478975478.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/20370141982.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/sirekibimeloxevav.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/wupinefaxofewalawuzuf.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/geruwelilavaxofob.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396b8ad5e37---24999893514.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/65b5ba4d7ead8bfd393c628582cbf864/piteken.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/rizomaridepazeton.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/dokafuzeguwad.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_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 10708 bytes
SHA-256: 47360fffab4eff11e5796083742a764592a8f4585b95d408bc88149d51fad33e
font_01_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 17176 bytes
SHA-256: 1e6eec47312f103effe98eff39ec2d716846bf0b12abb9602c095e6830490aca
font_02_sfnt_off000125ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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