Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc6ede1380ba8a5b…

MALICIOUS

PDF

93.5 KB Created: 2021-07-01 12:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 67096806ee4c0006d4c2b6a8ae2b4b81 SHA-1: 4104d7736b17da41f885b99e483bd84cfe7b2665 SHA-256: cc6ede1380ba8a5b5b8b49ccbc97b8a0b27c9eeeb8c2eb95bf24228378163704
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI links and link farm heuristics supports the conclusion that this PDF is part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://a1-automotivegroup.com/upload/files/rerovasivilikifiwapagi.pdf In PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4090456e48cbccdf46ed9190ec39d568/14393612891.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aca9679e3e---81133025560.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/nutulipujewoxujilinijanu.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/ks53fbpuf4c29ga34nlcn4h60m/15760171631.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/00a46286061af00ca896e8ea002d0e6b/zakotepegenukitumam.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/lufawede.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/vaduxovunomukoboku.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/93026a476e014288e5ca87ca3018ed88/26356790553.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/5fda2732d8d98af3c1efea97314a9cdf/rumodabapimexikazu.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/19/file/20210619_010342_117.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160851ae9eb70f---nejubumit.pdfIn PDF document text
    • http://htwy.com/upload/file/newulurajax.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/43929766177.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f27b31caf3---pelixakiwa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608334de7aba9---21609675426.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/leqpipnqld0efnhmm0suuapvm0/gujewijuzafenujuzupu.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/dk9cdqs4bcojm9e0pam58tdno5/wararenizolakodivomusavi.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//benalexotafixowimameru.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/64934175018.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/5a1472e878e17b88401852b7ef55e780/ziwajovovataxutinuler.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/f111ceb536dd843e6802e31b7da06131/ziduvewamosas.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/3de8be32394a33428cd75f6d9fa01618/7367505624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=c%2B%2B+concurrency+in+action+2e+pdfPDF 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_off000109a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 17764 bytes
SHA-256: defa95d18f1537aa58954aeb76c306ee12d65154ce2fb6e56933a00f200c99b8
font_01_sfnt_off000137ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15005 10764 bytes
SHA-256: 4f99535b8dc379a231b7fbfdca58923254b68f12062337b132964671f8893ab6

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