Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a9586f7aadfdf9…

MALICIOUS

PDF

149.8 KB Created: 2021-09-02 16:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2dbc655dac6236a7b640fdd01c92f69f SHA-1: f119799e0ef5134ead3eff72935197d0e79b6131 SHA-256: d0a9586f7aadfdf921c1174c9fde6a3170aa64249fbac2b025ae7a0a4249674e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and other disposable hosting domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://crysiq.ru/uplcv?utm_term=implementing+change+patterns+principles+and+potholes+pdf PDF link annotation
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/2a0c4fed766f345818c10b96b336ced4/96362644635.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/pibepepus.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106140953324369.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/55291025682.pdfIn PDF document text
    • http://littlefreddieking.com/clients/65037/File/tivakomuseg.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/xawuzalugi.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072fddb644c5---sutezebonojixebamogosuweb.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/bedixibiwipelabadufi.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/53600700382.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/gadilonativ.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/tinozosinine.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/32410027764.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607405b341f95---27568084873.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9760e78fd04edd9e4d9fa8889186cdc8/rakegaterogetovo.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/vobubomovenaxene.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16092c2f882ef9---devazogenipagemogedav.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/43859098450.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/digowujulabadosoj.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/54553638156.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16123b849c93d9---86503535227.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/ce3943eabf9c8e1eff2dab3183eb65d9/12414402246.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/desilupugozag.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/7196717862.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-18/20210518144853536541.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_off0001d9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1C3 23408 bytes
SHA-256: 845c4f8a35eb319dcff2ae7dd02ad729b218c8f824db307093cddd2a00ee63b7
font_02_sfnt_off00022f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22F4D 11016 bytes
SHA-256: 60aaa8f9971c1039e6ae0bcf1cabd3d2c8584bc3d347b2006757b8b368264131

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