Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1136964dc7e15c…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 14:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 41e0e5d18c7b205ff98e97998f127d8d SHA-1: ad2a4bbda5566ddd778e906fa5dea10152f3265d SHA-256: ca1136964dc7e15c938186ce1a4faa925fbb8b812d2410b5233910c33603a540
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or tech-support scam. It contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting an attempt to distribute malicious content or redirect users. Although no executable scripts were extracted, the document's structure and URL patterns are indicative of a phishing lure designed to trick users into engaging with malicious links or content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/voraj.pdf In PDF document text
    • https://hoya.hr/UserFiles/file/20978457162.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/pavobudimoxo.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/jajetokalovagegusanilapa.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/36bdda0119f6769e28278c4c099386eb/95109787435.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e69adac52a---girubigipijexenujuzukojut.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/lesobudub.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/36003471733.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/nebojid.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/fagukufira.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/nurapanijunafefigixix.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/39926100634.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/lixixalalutuwewo.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/76670466791.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/16333152799.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/hsupo88qftk1hss7a6mdtjptm2/mijolumibu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebf9873de5---zaxozamupepetawivisexi.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/51076350921.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/67521851895.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/mivus.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/50574328180.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/bazilonera.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/5upfatpit0ahj5rr2l87tv80n7/jafavopokajafazakonemog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=watch+basketball+live+freePDF 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_off0000ecaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAA 10500 bytes
SHA-256: 14210189a21cc32e1cc20c5da66dba9290b3bbaf13bb0300d5ba3df01a09b291
font_01_sfnt_off000104c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C3 17868 bytes
SHA-256: a1415ba9d454f4d948bd39d68f9d81d6ee1663ff987470a7b3a30818e25c9b5f
font_02_sfnt_off000132f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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