Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a2768d6202f077…

MALICIOUS

PDF

86.7 KB Created: 2021-06-25 22:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9073eb15f1f365023f49fa157a0ea9ff SHA-1: c7f034ba08b519be80d93fded47c52f424da3508 SHA-256: 54a2768d6202f077e11d65a0b01b120c367267c03b6987dd70fcfd46ea2c1b5c
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 high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The embedded URLs, such as http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609871bf4e333---pewadojajopejosuju.pdf, are likely used to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/c1tj0fqsc3r0v1fjdqopimo2t6/77086001931.pdf In PDF document text
    • http://simonide.org/userfiles/file/81603333775.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609871bf4e333---pewadojajopejosuju.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/12vocr2d95hiqlmf1kuc78mmt2/83508983145.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/533733473b165995b92929a49b43fa13/39003225916.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e0f0b37278b68e13a59de6499ccae9b7/golekax.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073743240209---10491876634.pdfIn PDF document text
    • http://berbun.com/user_img/file/57213612797.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/9173798462.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/96898670893.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/4d38feff211e3efe8e3eba4f7e406f05/fanox.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/sisowumenozod.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/58895713276.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c456d6a2f4a953d2b079d0ad65d9ab07/zamoxedumasegowaguz.pdfIn PDF document text
    • http://heureka-cz.eu/files/ditulariladunekekaxi.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/lemawitavelad.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/u7iaghfe8birrliher3gskb543/55669677360.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/i7kd6itrcc9olp3po593cgkrl2/85977304134.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/2ens63fqnh509kdu1pdq83oov4/7050458209.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/58ca292c39d7fd864812e5ffbb475d55/pugodavidakowidolarokoz.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/7082594554.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/e3598s8v9ps4aj3f1h5k7oih46/nusekosuliwukipinigofi.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/958dl6pjp5mb2bsk44gu3525g0/75951551897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=jw+bible+trivia+questions+and+answersPDF 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_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 10772 bytes
SHA-256: b46ecadc212e215ac13a3754091d75fbdac351a0a94b6b311fb3647b4bf0db43
font_01_sfnt_off000108dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EE 17140 bytes
SHA-256: 355c6c1c7bb01c671f68483e41af18a9849748be46da79fb541497464001f5de

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