Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b26195ccf571df…

MALICIOUS

PDF

67.4 KB Created: 2021-09-26 13:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7055872aad73a74a8eee6b4b5285059d SHA-1: 9a2cc105f698ea4ac5a88dc8f34f3fbc12b7533d SHA-256: 61b26195ccf571dfd26a3a74c9ae5548ac101022d788614d1ef377bda26c1d77
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links to external PDFs hosted on compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. Although no scripts were directly extracted, the PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/83663a4d5c6ef5a756f0e5ab8efec8a0/pujasademexejutafon.pdf In PDF document text
    • https://zlato-eu.cz/upload/files/57967210738.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/poxuzusawesugafimazed.pdfIn PDF document text
    • http://gojjang.com/uploads/files/73123133418.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/zerukalukawexijibunip.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/14863648826.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/11334306003.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/gowowebubibamokid.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/kawabuvokaxalapaf.pdfIn PDF document text
    • http://vhktn.at/images/content/files/gopol.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614830daa35dc---67729716171.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/41509199461.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109240946495476.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/89578835521.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/limesaxutizuxonurabeluj.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613004111869a---kuwosifixitokane.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210910200328.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/biganasumiworafinusoju.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/kunimixo.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/86422303988.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/kinepameguxasokuko.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/fumegudasimevigegumadekov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=highest+mb+game+in+play+storePDF 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_off0000acb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACB0 14136 bytes
SHA-256: 5be69e767cda43350908be314ea98bc42efdbbaf403ffc8d18dae49134b6cc9c
font_01_sfnt_off0000cf9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9B 10944 bytes
SHA-256: c0bd70dbf6ae5c1a051a3444710288d60db78671c679f40624038211e09e7055
font_02_sfnt_off0000e888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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