Malicious PDF — malware analysis report

Static analysis result for SHA-256 3376129f56e6d6ff…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 23:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df1669d73e79bd88f7055bde511cf985 SHA-1: ad6767b7814fbd104c333ed8c243018d25fc43c9 SHA-256: 3376129f56e6d6ff9ffe70fd556047a3cbc122a5f99cd01e34c1fb604845214c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://medvor.ru/uplcv?utm_term=car+parking+multiplayer+cheat
    • http://sinostandards.net/upload/files/62785741669.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a30e0c8203---fugazokonasufa.pdf
    • http://bygreenpure.com/userfiles/file/14302555471.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ddaa6890c---25901109519.pdf
    • http://alotercuman.com/ckfinder/userfiles/files/10282074034.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161398060807ae---9253848533.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/85788804345.pdf
    • http://xmzhj.com/UserFiles/file/sapiwefediv.pdf
    • http://pronobile.de/catalog/file/dadefepusake.pdf
    • http://theffirm.com/userfiles/file/lakixer.pdf
    • http://sbriz.ru/userfiles/file/tupijuvikizu.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8k3v4t12fuia4tra55ofeik6h6/moxokajowe.pdf
    • http://datong-travel.tw/upload/ckeditor/files/20210904215653.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e3f953f5f---lezolizunidikupodemo.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/rg2ipkkuikn44khmc4cg2fgv8b/fifola.pdf
    • https://senarathgroup.lk/assets/media/file/wopub.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/21854800304.pdf
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/gonazurigudigidutofeb.pdf
    • http://educaholistica.com/resources/img/imagesck/files/50644869183.pdf
    • https://europawindow.com/app/webroot/img/main_content/files/47140436482.pdf
    • http://wang023spa.com/userfiles/202109file/2021090610582770554.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138ed0a6f54b---78765684760.pdf
    • http://vector-food.com/userfiles/file/74514138904.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/qo2hec6m0j263q9ebpoimqfuc5itc33v/55176381343.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/bojodanavaxexoladivule.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_off0000da29.bin
25ce3d8dc23dfde0b00fbc0d522d8bce4e72679f8706faab01df0caee447ebb6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 10872 bytes
font_01_sfnt_off0000f315.bin
e1c50d8690d361766a5e54fe2e1b1f07f43b9d1820948e13d84351a442e0f84d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 17752 bytes
font_02_sfnt_off0001212f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1212F 16792 bytes