Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf17b8662e596e5…

MALICIOUS

PDF

85.8 KB Created: 2021-07-19 05:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18cce624b2a98f895973d306be70ab92 SHA-1: 57576b64631d0739fa7a2e9cc4da1d5b4ba20cf8 SHA-256: 9bf17b8662e596e57f02b52bfd07ba805724efd735c3a72c854f656f96e56070
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to manipulate search engine results or host malicious content. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kukubara.com/zdjecia/file/63490236464.pdf In PDF document text
    • http://alkanboya.com/files/file///28208226489.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/8o2mfq6em3d984tjlietaf23d6/874860176.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/56186801445.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/xademoje.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/gejerad.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/7041b76af29fe975e556eb85726ed143/piputurigelemobi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf2fee9c8e---sojutamumaverewetenoduveg.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/6774254ed7f9f17d65dd669f27ae3f66/75007025238.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfcad33903---28864910448.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/96621298438.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/47886920674.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eca29ac91f---28765720621.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765d8543941---xojegixigosadelep.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pupogupu.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8326ad4cdd---85381199214.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5b2a990f4---zeseb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b656207291---motabufitu.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/74917881721.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/hmg3huoes14dep04m7hk2bnns1/33528659399.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608761cdc1dfe---rereni.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/42346299920.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/25866946115.pdfIn PDF document text
    • https://dineflon.com//files/58617964193.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/81297253220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=richest+psychologist+in+the+worldPDF 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_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10430 17216 bytes
SHA-256: 79e510c1b6fd5945e77e3a82c03ec3de8ec911158cec9fd940b37f9bc7d81ee4
font_02_sfnt_off000130dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DC 10876 bytes
SHA-256: bc0990fd0b786deab0c5e4a3c78a702fc9e7db3df455793de04e19eca695a573

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