Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0209166ea7d6568…

MALICIOUS

PDF

99.1 KB Created: 2021-09-05 02:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ff6583253e72f74c5816b8344e9f716 SHA-1: 495c3da9f2c87d58cbf9c502b660cb50335d0d04 SHA-256: f0209166ea7d656841fc7b35e2581a28e5e135a172fa439cb15fb0464b933bf1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download' button lure further supports this, aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=personal+possessive+and+indefinite+pronouns+worksheets PDF link annotation
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1de49c83e0---sizafejuso.pdfIn PDF document text
    • http://castel.lu/userfiles/files/11207668440.pdfIn PDF document text
    • https://shibbirs.com/media/files/13270601914.pdfIn PDF document text
    • https://wrd13.com/force/file/54474910549.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021823184278143.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/389809468801662ede89cdff3b0ab051/81769515325.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/2211957201.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-1/20210501152425447530.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/xexepi.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/zibofe.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/d53ffec7c5c99efddf877db056e6e263/48445514865.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/zifisilifutofigikusubide.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/82115343906.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/remokezalekafavaxakoviki.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/xemotoli.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c70065b397---bibis.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0482fca970---30790574420.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/gupomerewuzubanudimelugix.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/sedelas.pdfIn PDF document text
    • https://ckmandarin.com/uploads/gilimapejetotoximobi.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aad83fc3259---ludapafuxukesuzofajamel.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/fupadifujo.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_off0001192f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13146 10940 bytes
SHA-256: 0ced62bb58582f1e2b777010c4ada77975fdaa60a2f194b8b782a3bb5b1fabf9
font_02_sfnt_off00014aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA7 18924 bytes
SHA-256: 8de53eb20bafd3fb55969ba128b50af2c7cb4bcce014687c164409b8a4ce3ff3

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