Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57122a5d34df949…

MALICIOUS

PDF

90.3 KB Created: 2021-06-27 00:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 403d52e6f1cd875fcdff2ac18a3379d7 SHA-1: 10c83a02e0f26c966aeb23e28e688ff3f24c2883 SHA-256: b57122a5d34df949c75980c0dedb0f0618f0d427b4b6b751266f31d9826744ed
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://synerhu.ru/uplcv?utm_term=vip+2+full+movie+tamil+download+movierulz
    • https://chris-arnold.com/userfiles/file/rukinamaxukedaji.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/80e3c9b40735b1cd0dfe979bef269b2c/filivubafikajevozax.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2308018fb6---rekuziku.pdf
    • http://komputerzagrosze.pl/userfiles/file/28464445086.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16085d82861f22---zukoxit.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a09ad6752---jixuguxinerisetep.pdf
    • http://massageindex.nl/images/uploads/51880818176.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d9fc3e3db349787453bb6cab75ce4ca1/7237709126.pdf
    • https://wendi101.com/userfiles/file/gemumevetegotagobanaletug.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/8e2f0cea27946248c10e2adaa1dbcf0c/punoge.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/hofoc16c0nlneh8cl2dennoh21/pakabagimatiwaxo.pdf
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/kisegijawobazugeti.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/496bemqdhsfimcr5dse0hng124/71216785844.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160d7969a759a2---28645982019.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096971ff3501---53263693065.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070189bc9a89---lefiziripeji.pdf
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/96219775628.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acfeba13179---texaguki.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72dbf02295---31209152255.pdf
    • http://chipublichouse.com/ckfinder/userfiles/files/tozumukevuruda.pdf
    • https://transport-vehicules.fr/userfiles/file/79748786103.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/76868773718.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be5f1dd4f97---3594320867.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/7b04a5760b9d6b55de4a21c67acb539c/67645275456.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/40167d3725e97914d6a0c7ec61a9404c/keritajulazidefevow.pdf
    • http://incomsistema.ru/ckfinder/userfiles/files/64729322602.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/cb520d43a2c59a48c914af1ddb2b2230/kedufuninagunevomami.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd99.bin
5cc2d7b53477b0c8043b307638e6031bd737e58a0e75a3ed9088da7d1bb91ad4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 10892 bytes
font_01_sfnt_off000116e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116E0 16792 bytes
font_02_sfnt_off00012ef2.bin
f9782e29224a35460b85ee44ab2b499c8f1c4d184443e07da1be4f71e3ddec18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF2 17384 bytes

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