Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfec536e6f9d9735…

MALICIOUS

PDF

72.5 KB Created: 2021-06-29 19:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3389325a2b5624e0c65bed1fe5ee6c18 SHA-1: a0448c5f5cd0c65fcb6e3206b8bd733c408683d4 SHA-256: bfec536e6f9d97356862ac7ce12919fbca07eebb645901594e7369d61417569b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as lures for further malicious activity. The document body was unreadable, but the heuristic findings strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=what+does+tk+stand+for PDF link annotation
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b21a1d581---nusutalejomi.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/li1gsq8g5l4q5m25pnjeqg3nd7/basimebexapefozufotapibam.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095cf6e57b42---zojexama.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c852578823f25109924bce6f66baf567/tixaroziwezovi.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c140e66e3ce7a9522d7db728479f1a00/87997368200.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/jexuxadoxitiburiwesul.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/61dc5583d94c152426e749dcd03afa09/lonufe.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/weburuvevagadofiro.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/gapipexubobudevo.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0b622dc98e9c2bc8dec0acd98229c3db/84184737444.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/tirawifo.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/bpl6sh2pfvh8d270l6mqpld71k/konejimulajoxirurikozanib.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/wivolulalifadag.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/9307941558.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949d3a7d5d5---telifadawak.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9927f7e214683fcdd25f5ec9ef40f4f9/kusawazidimid.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/panh97b7el26slrs2brtje7dl9/visabojanurusobotuk.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e1ffc6c415070af858d4868966fa0521/78713160914.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/woxovuwuwikuwo.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/kadezinafisag.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/10475507350.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/86011212770.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/37191269311.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/pebuvudigizosexafemofo.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/2lc44e5nt9tvh2a3ci9oi8mor4/mebafibusesodefibuk.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_off0000bcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C8 15712 bytes
SHA-256: bde654bd34b4fda24ea31eaa6bf0f3a68ab55ad74935c1619280b2d3b6cc2dc3
font_02_sfnt_off0000fd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD29 10400 bytes
SHA-256: 15545ed775c24fc4a148c455a80964b5afb3b335447acdd860abb28bfa6229ac

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