Malicious PDF — malware analysis report

Static analysis result for SHA-256 88868d21a3ee02c7…

MALICIOUS

PDF

76.5 KB Created: 2021-09-01 13:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e693f4c543bc5d2d3fe369e6694b04f SHA-1: 4d7a0d98f6f62f70dfcb92d51b610ac3f76fcd4c SHA-256: 88868d21a3ee02c79db840fd58244f26b46221e8754da7b7c7ff58640ca9bf33
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, directing users to various external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://powermailer.in/userfiles/file/88197538598.pdf In PDF document text
    • http://agrion.org/upload/fichier/34476160611.pdfIn PDF document text
    • https://nasikampung.info/contents//files/32040245202.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2078de8f1---77219587150.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8ea8bde78544e088bf091cb14646736e/91418949923.pdfIn PDF document text
    • http://accronline.com/userfiles/file/55818343917.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/19a7f192bcbd99e404922f8c6eada720/dududaboradi.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/nilureboperozelanaxibowo.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b1d29a77d39dbb9748fbcdb5406cb888/garawatifabovedazir.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607318081d132---kutonuzof.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab36b552c63---84193274810.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca8a9e5e2f9---noxarawasigunoludaxagataz.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5520fd206b---53662912050.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/dbgmggbjg6e3akb40usq2brqn4/90518515930.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/92974314315.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/rorssrpvvpvv2jjkh3dcu2v3c9/2118408745.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210809080831.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/murid.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d334a5c6b---82239280220.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/4337464291.pdfIn PDF document text
    • https://topaldanang.com/uploads/image/files/tawufedunujesaxexilul.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fc7f6d6a5---91747264446.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/vcudkfo1js3u862l9ap4qtkrs7/79009482803.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/vetoxixejowamiben.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210724_001956.pdfPDF link annotation
    • http://finalbrand.cz/upload/file/94421334559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=counter+strike+global+offensive+crackedPDF 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_off0000c692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC692 16516 bytes
SHA-256: 21199ef29a9a4f2c648a809773ef94742c675cd80175beac26ae4a04c3cbf74a
font_01_sfnt_off0000f187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 11080 bytes
SHA-256: 328027a1e3aa884e6cd114938e9a64e221013b164e1d65656406e35d6cafc795
font_02_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.