Malicious PDF — malware analysis report

Static analysis result for SHA-256 54dbf59c7e916b5e…

MALICIOUS

PDF

79.3 KB Created: 2021-09-03 14:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7815698a19daca4f3d1c3abfcc8cb167 SHA-1: 801b06147c7f2562fea235c840cbf1112addf42e SHA-256: 54dbf59c7e916b5ef1f6b39b634f52b262b7fab5386f938c10e0882986a09eaa
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. Multiple heuristics point to the PDF acting as a link farm, directing users to various compromised websites and potentially disposable hosting. The embedded URLs suggest an attempt to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=firefox+manual+proxy+settings+not+working PDF link annotation
    • http://tragadsonisurat.com/ckfinder/userfiles/files/kesalof.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b05fa1119b6---gizos.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/6tsna172nkhatr6p0ufe7f3cpc/21313967940.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/79421029505.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/48606222662.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/17102351150.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/gejolusidexudokesanozarez.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/15730021717.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29d9361daf---gonobedamoreberekav.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a6cd76d8---8133063211.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e09132136e4---komaraxezuj.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/a93bb7aa28f1f99e8cadad76693f802b/98459287308.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/28305080460.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4cf968ae---18712753697.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c91074e755---4813681084.pdfIn PDF document text
    • https://ienter.bg/files/bilisateze.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d69b6e0e9---30099347791.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/acaffdaf6f29dfb54843cc61f0b4562b/xaberojesubewuxikaveba.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/33068144863.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/55044343481.pdfIn PDF document text
    • https://novsport.com/content/File/dezezamare.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e3f69b06f---91593197957.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/0c60b7775f2d319531a93501ab00d2d9/95821357144.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/gno20bj2qq30cc6nqcuk8hilq3/pususiwazizofuzewuviwali.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_off0000d005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD005 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 17552 bytes
SHA-256: 8936299b35dbe69cc640c5c432b39f90a3b0a264418930180e7d24ecc6b737ef
font_02_sfnt_off00011534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11534 11172 bytes
SHA-256: adeb08f50c9244fcf11e3a06dcf563b13f0a4b80a3e206d514f08011f8eccf22

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