Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d8c173c707c731…

MALICIOUS

PDF

94.7 KB Created: 2021-07-29 14:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 34c03f5f02f9262afe1232582905d710 SHA-1: 6c2c1ccfcc4bd68094d1c03649476cf4093b8e69 SHA-256: 06d8c173c707c7319988761fd3d97a7112f9b1be834add6545e4e825b124e093
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with multiple distinct hosts, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/c9a4e66ac47fae25869f03684b72fd1a/wojesemivuwe.pdf In PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/39431470576.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/11267953253.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/rowufoxu.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/4392583379.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16087b68a5dc39---44505787414.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/46962598025.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e51fe63fef---fagilunure.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607940ca42946---wudubinopaketu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1ce8b72c7---xibapudi.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b2924310efde4cff4e1f87583285cfc0/lebatufujovagotix.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/12775038157.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084dbe9442b1---piguv.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/xokut.pdfIn PDF document text
    • http://altinay-law.com/images/file/40442687067.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/46853780375.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e077e4b755---vopuvez.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/tafizugoxixilasa.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb8e2acbfb---73929561463.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/22b3f457e599dc7724e5025c70957857/95914408564.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ee82806a6c6---1166516735.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/56149226428.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/nidudopusizuvitug.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/fuxumujomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=is+there+a+season+2+for+war+of+the+worldsPDF 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_off00011273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11273 16472 bytes
SHA-256: 7497ef6418588c9824066c070367ed22a779ea5e65c1e5fe17403e4eaf37a36e
font_01_sfnt_off00013d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3D 10516 bytes
SHA-256: f01c6a48c7a0623673ee1798400bb60405400e331beea343da3aac1c59288a44
font_02_sfnt_off00015549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1