Malicious PDF — malware analysis report

Static analysis result for SHA-256 31658a1cc6063d10…

MALICIOUS

PDF

94.8 KB Created: 2021-08-14 18:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 029e470ed661647e6da047265a0045cb SHA-1: a06066a28615c7f81018f450e8941ac41594a1b5 SHA-256: 31658a1cc6063d100cc127461f9b30667ab2fa5f7f99b60dd6908badf3c3856c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress sites, many of which host further PDF files. One link uses a raw IP address, indicating a direct attempt to serve malicious content. The file's structure and the nature of the links suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16074baf53ee0c---73048199267.pdf In PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/68215123758.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d4df0f693---wejujexima.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/24e262e7e7579883c65eb40c80e258f1/kolegunejunusetavudezazi.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/dedaxa.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/34879124997.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/77484825704.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/52946996301.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/4j3prvigluor7pudjh6d8m22i2/putagirilom.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/32874922649.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075fb7969d5d---daxabeles.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/109f6776e5d783d4edf543698ac4e60e/17104749745.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ac2559059e2caed1ce54a21b62b52819/pixipafesemonugalabozasu.pdfIn PDF document text
    • http://merwepizza.com/upload/file/6155843654.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b32445b5ce---guzowopexijozewovonamowex.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f40e0d084e---dijoreworilutefex.pdfIn PDF document text
    • https://go2germany.ru/files/file/34014909052.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5526515bb---sosowatudajosapuneveke.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/tj5it6b6t5te6065ppo26ak8l4/vexuxinanogufudetujudijij.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee19c8bc27---18460678016.pdfPDF link annotation
    • https://responsible-tourism-alliance.com/content_file/files/pugenijewewugotopanuvo.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/lufakavesa.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55c2a4dfcd---43608211712.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/tozulezegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=why+is+my+internet+light+flashing+greenPDF 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_off00010c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7C 17888 bytes
SHA-256: 580bb73bdbde2874154a80da94b0f8252b559daf3da95982b1acddae54045549
font_01_sfnt_off00013ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA1 10648 bytes
SHA-256: dabeb6b40125d3a4cb078c80bd1e5b3bae918913166ed9e1e8dd61aad0c38ff3
font_02_sfnt_off000153d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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