Malicious PDF — malware analysis report

Static analysis result for SHA-256 092f5cf421add5e8…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 08:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0f722664abd17e9aed2695e33b96e853 SHA-1: d89075741674e0b46a39632bae9203c94f964768 SHA-256: 092f5cf421add5e8064d2c74b04669c4a38aec9a06789bcddaf4505ded2b1d5a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://janatalnajaf.com/basefile/janatalnajafcom/files/vurufas.pdf In PDF document text
    • https://atrax.hr/files/tujosajenuxakerupepe.pdfIn PDF document text
    • http://webbuilders.com/files/file/29319407152.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210718235618.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7146c25bfe---86124951470.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/gikomufisijizamibakufo.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/kupusatejerurugenoju.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085e6a8f1853---26726465908.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c2afe649f13---67558325722.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/xusebewewetepepodaloti.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/5838673685.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/407c702b433bef4adcd70470db92e1fa/24321611278.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/9eipem925nbon783t1hj4h69am/kezute.pdfIn PDF document text
    • http://xsteelstock.com/d/files/pafaviwiwebivopanozifo.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f026ebcd---pukumomegavizu.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/37386356075.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/34637063725.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fc12cfe55---55457678238.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/8cdsm6k49qlsml1diaglln4rqr/tufiwegonunikelemevanede.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/25992316325.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/40744555386.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/e4dfc22032f8f5140d473adaae85efed/gaxaresun.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/daworepafufulewagepe.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/tajoladezujetopaxexege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pollution+day+2020PDF link annotation
    • 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_off0000df95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF95 17188 bytes
SHA-256: 92c407cc7ba0eca009576694d012fad8084b1588bc3057ed68e55731657d658b
font_01_sfnt_off00010c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C29 10300 bytes
SHA-256: 8f9386203c62a79e6cdf3a0177d652e19bbd8ab93253502b38a8a3ad302337f9
font_02_sfnt_off00012389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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