Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6b345600515747…

MALICIOUS

PDF

97.0 KB Created: 2021-09-07 14:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9c45e369e1b724ebf3749c9a3a9f68d9 SHA-1: 4d30ace36ef5c62220e9af8be159e05f3c64562f SHA-256: fb6b345600515747f9f8d797e6b6a4808bb4cf30703eb5fcec355f849a94eb3f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to deliver secondary payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier clean score 0.1206

Heuristics 5

  • 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
  • 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://nomylo.ru/uplcv?utm_term=rotter+incomplete+sentences+blank+pdf PDF link annotation
    • http://sushinamu.com/uploads/files/45004026010.pdfIn PDF document text
    • http://mextro.de/upload/files/wokobuxumizo.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/83823340510.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160709248846cf---budub.pdfIn PDF document text
    • http://sam-global.ch/files/file/9567213488.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/fisumekotitipokakabit.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/nuzarajirur.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b263394b37---tisijujomanujipagezodafap.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/1lik8eqn1vkftt5grnhbu3kaf0/fubizirunak.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/bakifaz.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/06/20210616180930.pdfIn PDF document text
    • https://primer-spb.ru/files/files/70781007725.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/bexagekumapuridesexixa.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/ffbba73ef630a8ed6959198babd98bfe/japumafufo.pdfIn PDF document text
    • http://fabtur.ru/upload/files/89417480215.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///46930152384.pdfIn PDF document text
    • http://gibisch.biz/files/files/lejaxanuxekisosazar.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/74911320634.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/lifudalofeku.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/1946810922.pdfIn PDF document text
    • https://phr4u.com/files/36009615345.pdfIn PDF document text
    • http://allycatering.com/userfiles/37179734490.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/39168788105.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/wibosuvenelat.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/rojobi.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612c322301d95---tuxobijudoban.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000162d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162D8 11056 bytes
SHA-256: 15defb33db9837742377265544c86a785d1515db6cf77acb32899ae5facd1267