Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0b6766cfbbe9fd…

MALICIOUS

PDF

96.5 KB Created: 2021-07-06 16:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b31dcc91fb07aed42f09687585f4bc8 SHA-1: 81ccb0dcc5abed060ba182dc4ebc6eef3b591513 SHA-256: 5f0b6766cfbbe9fdbad1a5f79f1b6017cc04f6b643eaec497933d9964e09293c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads or hosted on disposable infrastructure. These links likely serve as lures for phishing attacks or to distribute further malware. The presence of multiple external URIs and the classification as a 'Phishing.Trojan' strongly suggest a malicious purpose.

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 https://allytemp.ru/uplcv?utm_term=how+much+is+a+few
    • http://studioprogettoarchitettura.eu/userfiles/files/47509816977.pdf
    • http://fatamorgana.fr/uploads/assets/file/meravikesubeniposeb.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc2622826---32638162125.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/semixuwaxapisefigaviwusu.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/643cad67a7f0148b0b8e4e6dc52ba616/49449662985.pdf
    • http://m2m2design.com/userfiles/68834360395.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/wulumefikosaviravedoki.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c21adb9edca---50336870200.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160872be3d6502---6247824839.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092beb53af34---sakubekimibujegin.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca1de3b93---wuwibos.pdf
    • https://cr2tek.com/userfiles/Proj_Name//files/95346191103.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/9b7fe3772b5e3ed368ad98dbc9736c1e/gijokariziwixesunubo.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b498d1410fb---wegasilaxejajugagajo.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160810b55a2f93---77992267897.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/zofizoxibomonisoxujudase.pdf
    • https://mps-india.com/userfiles/files/rerobewopidokixoj.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a4649d5b5b7---vamekudoz.pdf
    • http://chronicles.ae/userfiles/files/43531396044.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607714884fa31---78281703076.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608281e2c5fd9---94897569401.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f801bc6adbec9e2e7c48e838d897c2ce/rijiwomibagibapapab.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/ad9441f459f1cc27d233c7411725cf7b/mibudikumaw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010892.bin
dacd7a6d83fb870b2a13dcace629f226efedfb181d56038fffaffdf5d27f62ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x10892 28988 bytes
font_01_sfnt_off000143a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143A3 16792 bytes
font_02_sfnt_off00015bba.bin
42fc3870406989adcbb6c1d458ed1cdbd0d236e0efd472a51b58353a11919f09
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BBA 10432 bytes