Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0aa374ccf2ea823…

MALICIOUS

PDF

100.0 KB Created: 2021-08-02 10:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c4b444cc67dbb5bff30c1d53e78e71f6 SHA-1: c928f5724b91937274cdae3696f5dcf2a61476b4 SHA-256: f0aa374ccf2ea82318481f50f60efa145cd35538d53bc91abb87e0277ea982ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure, likely leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881611b844d---pixeko.pdf In PDF document text
    • http://industrialdevices.in/uploads/gomijobapew.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/fecd1f06e798ef65ce4b52f0d0a3cb48/10040428870.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/muluzumosafoguredumovis.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5d0ddbbcd---60326904480.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/7f5b0592e1d22863cd737fccfaca4ad1/bixagikumiw.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/nenedasixojadosujanev.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/40147426370.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071533544857---87381432048.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/g826hls1pact7csolo17s5njc0/desokamanixisixolugajaxo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/86207549258.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/ripulivetebivume.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1092e91bf---tobejewusur.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/suxupitazawolowijisamato.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd1cf3dd0b---24741658386.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/98166451642.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/40558406701.pdfIn PDF document text
    • http://shophouse.info/images/files/65006011706.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/16869634565.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606f976dd9ddf---71589669305.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c8f38184d8a5d07619d0dfca90eaa098/polexajevozogejabokolozet.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/43039943177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=download+minecraft+1.9+free+full+version+pc+offlinePDF 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_off00011bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC1 11320 bytes
SHA-256: 8e26040e74c644bd511765cb77459eb7aed58aa973c7b3a958207d8556a6db07
font_01_sfnt_off00013675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E87 19228 bytes
SHA-256: 6478a30c77129c4af757ceb1fd70ade6d222f49aa800a6feb288824fdf5c6807

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