Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b9ea2b252f374e…

MALICIOUS

PDF

80.6 KB Created: 2021-09-15 19:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bbea2557ffadef0e546154c47c9d4adc SHA-1: 9edc9e0c1087cc521bb07f038e30ebcc41e8b851 SHA-256: 89b9ea2b252f374e260cb614a63847588988e28fc420ba31a0983de46919945c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and link farms, many hosted on disposable domains or compromised CMS upload storage, indicating a phishing or redirection scheme. The 'SE_CALLBACK_LURE' heuristic suggests a callback phishing or tech-support scam pattern. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to credential harvesting pages or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://oniceh.ru/uplcv?utm_term=o365+business+login PDF link annotation
    • http://tuzy.pl/Upload/file/lujemug.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/65084542422.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/h75fq9hj6408m0vvrhbbk8rne4/muzusamusaxopalegureb.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/78505764704.pdfIn PDF document text
    • http://portableandcool.com/files/files/dufolari.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/bilumamijox.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/rosabotisepezopis.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/fusodatik.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/47131638385.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/jagesulorezufawegezi.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/kuxamoli.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/tedarozukufedowitu.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/96290444096.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/67680193628.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7cfcf31d---32878096892.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/91374143289.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613580d7afff8---45835387564.pdfIn PDF document text
    • http://ave-france.com/pics/files/bizulelaruwodemej.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/radegewurarapikituvoxi.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/ditibunabimonimokeno.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/saligipizelijiv.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/vufenoneduwodidutikule.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/977ccfa01e87139c720e2ef852a0a2e6/waneve.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_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 10660 bytes
SHA-256: 2031e180bb6b9738baac715b75fa4385999962ec516f9d7e9cffd268dd829987
font_01_sfnt_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 17848 bytes
SHA-256: 7370453cf50cc20c9282c9bf51f7dca537bdf986068d27ed4f75df89b961950c
font_02_sfnt_off00011d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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