Malicious PDF — malware analysis report

Static analysis result for SHA-256 942381be8e01634a…

MALICIOUS

PDF

78.0 KB Created: 2021-08-17 15:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f0a2437da67a2806c6b8a09a089e7bad SHA-1: cb907c9fff033aed17b29e042328d05314ff66a6 SHA-256: 942381be8e01634ab1bb38816368e388e11acab406b1fc659ce88eaf2e35bf0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to distribute further malicious content. The presence of embedded JavaScript, flagged by heuristics, suggests the document is capable of executing malicious code. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://fontaine-eva.fr/userfiles/files/davup.pdf In PDF document text
    • http://aftckwt.com/uploads/file/fovebasorulelerenotilovex.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4248a41080---67286236888.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fb8de10bd7d6226d5d6dc37b1ec2390e/zubuwuruxidewupug.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/56379237958.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/8035690169.pdfIn PDF document text
    • http://live-net.it/file/leritavevumudubow.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/96890029144.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/legasawogekenibuginete.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/f2f6d73519cfc4dc450bb46d18d53554/14315059913.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/g07mipet09pej8ifus45n59oso/retisixozadidotab.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/cf0f3bbf5d84e4fc2b5c532cab55cdb4/pagojejowubimudisex.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ade400babf9a4c8a99d88629117aa4af/58422298363.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/54712224636.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/rarexobukijukemip.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/babisawoxuto.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/fj1peo2qmu1fopn9hclqi21cg7/dewawebijawowodogojib.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/nogogoju.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/fapafim.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/38718638172.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160709af0ecbbc---71002423517.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703fb1a31d7---nowoge.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160da5163852a6---semaxulafaji.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/97310100367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+calculate+length+of+cable+on+a+drumPDF 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://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_off0000cd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B4 10980 bytes
SHA-256: aedacf5524e3d5263146e47a8431856db8af502cd44d957d27ae79e1e8db9c8b
font_02_sfnt_off0000fec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC8 16936 bytes
SHA-256: fadc469b64a4f39cb516f2e251629ecf190b51f96c9a98d950967c805d4e1c1d