Malicious PDF — malware analysis report

Static analysis result for SHA-256 5162539e70945c0d…

MALICIOUS

PDF

81.1 KB Created: 2021-08-18 10:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f7c2b2f6341a4d565ffb5122a89ebec4 SHA-1: 10eb723f3049533e01c1002dcdf3dc6b98a2e534 SHA-256: 5162539e70945c0d1bc801467ab6cfc9921bbc9f885801524f8cf92556b01eda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://hasici-pristroje-eshop.cz/files/file/61426104335.pdf In PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072353b80f35---xeledowibebeseg.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ukf55jhe6lq8bteh43l5k71pbr/79563670602.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e00df104348---21470662128.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/79541766201.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/28757651105.pdfIn PDF document text
    • https://cncunse.com/d/files/62806542231.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/76108625759.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/90426916019.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/jatizaromilodeperakuwawol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f21a0f820e1---86043167221.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072614054833---lobifaw.pdfIn PDF document text
    • http://compsult.net/userfiles/file/76034488790.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/1f120c40ca7435b754ba27d598d312c7/38183656547.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a172e59dffa570a11cb8eefc05433109/zelutomuzizopuku.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/81103652287.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b3d84309336233c9b33e8851d56035c7/62914822702.pdfIn PDF document text
    • http://kalikraft.com/images/file/88236370760.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/u68jjuhqdmqstpdgqd99rnh8qg/jigojawalasuvemopujup.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/medezaralat.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/78422036716.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/puwonizuwiv.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/kudog.pdfIn PDF document text
    • http://sushi-belovo.ru/files/60355371927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ide+ata%2Fatapi+controllers+meaningPDF 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_off0000d7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B8 16656 bytes
SHA-256: c2af50bc2629f046a2ef24ba4cff28aa85f0b6ca441b85b3f6b43faadfc2a2aa
font_01_sfnt_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 10844 bytes
SHA-256: faa812283624ef20f88d3f44d68c718a0be58c54aa72aeabcd4f8a89bb4726b9
font_02_sfnt_off00011c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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