Malicious PDF — malware analysis report

Static analysis result for SHA-256 13af3c33c7110651…

MALICIOUS

PDF

100.0 KB Created: 2021-07-18 22:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 80a4216caeaba70339b7faba5bb739df SHA-1: 4b9cf7ca27d8ab744dc7883d6fbeb40d1142e697 SHA-256: 13af3c33c7110651042cdeed581150942dba0d2cc88174620808b87fa87d79ce
172 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and numerous external links, many hosted on compromised CMS upload directories. The presence of a 'download button' lure and the ML classifier's high confidence score indicate a phishing attempt. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4461ef3447d64c9d387fa870db977d28/xezoxadupesux.pdf In PDF document text
    • https://fwullong.com/upfiles/editor/files/rinebisupe.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/penanuvafamopawitanux.pdfIn PDF document text
    • http://diodelumi.com/ckfinder/userfiles/files/finilewafafazapatobij.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/d5608072926bd25c8d1a6512da6e0e51/basuzogukitigogawope.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f93686bd9---wodezilivif.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/rsl2v83sea7eeq7vt52go4j3i4/13178736323.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/106857c84f775073393ac9cf5586b99f/40012855717.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2490d335b---doniravamagirub.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/f1a9445b403a34b161141293ca814593/zizigopekaneziji.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/61012974767.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/92472724238.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210708150537_aswhc1.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8f346c37---51477924913.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2a3b51325---gokivad.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/70053926574.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b37d61972cf---78321058009.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/ruzujafal.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/nubizatakotimes.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/3cbb07ddb0fe1e9097ab9ce24c81a4a8/5036062125.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/cb2c356ef0b785fdddb8224561e6f281/janulewilogisegizowazulel.pdfIn PDF document text
    • http://grimastone.ru/files/10665254985.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca379f2934---wikepukiwegagob.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ba106fcbe---51549891783.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/34969148696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+human+digestive+system+worksheet+answers+key+fill+in+the+blankPDF 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_off000120ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000138fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FC 17804 bytes
SHA-256: aee01af046e3ee6897fa9400ac6d710edf13889badb55ec8fd45e9cdb62b978a
font_02_sfnt_off00016767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16767 11360 bytes
SHA-256: 2b4c376f0dcceb4930c4a2f7128da421eb8a8f7bcc8dfd6bfe382cb10d815974

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