Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5a8cce7a350f1a…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 10:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b0768bf657e6c05371984edb578dbb9 SHA-1: 5191879ec2a61100cd8c437cb2c83e228e9883b4 SHA-256: bc5a8cce7a350f1aa0c80d1ebfbc0527f87e05ca9bc6d20d1436660b1c6f676e
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to potentially compromised websites or disposable hosting. The document body is unreadable, but the presence of multiple PDF link farm heuristics suggests the primary purpose is to redirect users to external, untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://laborke.ru/uplcv?utm_term=how+to+download+songs+on+android+phone PDF link annotation
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/14073750808.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/91258249716.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/rarofidevazerenojotiju.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/34653593326.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210926175230.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/37360479059.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/tuvelaxalunaniborako.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/50010926427.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16143af0173a78---xedibamepitawosibon.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c8eb9a086---tarimobupaviwegoxodapoj.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/23049155520.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/12581855575.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/3f776810c751e684686360eca5c3e21e/1445440730.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/49740162972.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/53977680624.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/48762142982.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/taruvugimesofis.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/tipamopito.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96880580653.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/salelemubavutamo.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/piwuv.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/lajomoferidowagowul.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_off0000b33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33D 10748 bytes
SHA-256: 4eaf4b69523e47d40589bede01a7f1d17b53d8648579d2552071d4bdfde62a7a
font_01_sfnt_off0000cbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAC 16084 bytes
SHA-256: 48f7270ab8f24ea666299fbff1cb2efacbfcc82738c27961362d8114e2a9d91b
font_02_sfnt_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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