Malicious PDF — malware analysis report

Static analysis result for SHA-256 722675b3fef66cd7…

MALICIOUS

PDF

81.7 KB Created: 2021-08-14 22:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9119481deec6ab56836abea512cfc6d6 SHA-1: a8a0021720bb6300c2d5dc878385d107bbd4b3da SHA-256: 722675b3fef66cd771ef1c5117d5a5173c2568d76a37fea9661eb17c3954c69e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, forming a link farm. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/76c768be158891454a9169bd978bca92/wobif.pdf In PDF document text
    • http://espacioschillout.es/images/admin/file/xininexosubakokuzeboxe.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff6e3e42ae---dunevogu.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/xifewulimitozazokisixoni.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160de1735c4d6a---91227752166.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/e57a7d4b2ab8f7f3cd2dc4e231758964/mitedamisaba.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/13521221897.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/sezazevaz.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a62d7f525---tujifutomimobowufebawak.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/655280727.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/c721e7c6efb741c4dbb188d945506a28/kumotulekodumexis.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a21a1ed1---93012430495.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/97332343749.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/sanokufukavisemoxitoka.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/lumanefetekijokufokekatap.pdfIn PDF document text
    • http://hibertek.com/image/files/20210801_225950.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/36387625690.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/68859926097.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/vinixipadexokagejog.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adff54e20fa---30383382811.pdfIn PDF document text
    • http://nfc.soo.jp/file/rimufo.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/25723094620.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/6egfqt64s6h7p5kaintlt45mgo/8948961920.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe2981e2d3---luvowidopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=does+cricket+have+free+phonesPDF 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_off0000dda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA7 16404 bytes
SHA-256: fcb38487a2c94a710ed0c695ea982337456def867eb08d4aa60b2fb3afb453d7
font_01_sfnt_off000107fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12013 10688 bytes
SHA-256: f610872ff1763b3d014b300fdfaf2c7cf8ed57e3c94515f2f684954f06a2a329

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