Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ca85d53741169e…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 13:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 928103e7c08cb04a4843ff384434c9ed SHA-1: 27453a65d18962d8caa6938cd5babb9745300691 SHA-256: 25ca85d53741169e1a6b426bd6179fdd830eebb3f7059acab65817fbf0829786
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous external URLs, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'SE_QR_LURE' indicates the document may instruct users to scan a QR code, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pistant.ru/uplcv?utm_term=iphone+read+qr+code+on+screen PDF link annotation
    • http://www.dawnrotaryclub.tw/UserFiles/files/64358017917.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/45194718961.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/96244121374.pdfIn PDF document text
    • http://fpole.ru/sadm_files/bimesiradezomo.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/32821253741.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/38601570185.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202192215712.pdfIn PDF document text
    • https://www.aspart.ro/ckfinder/userfiles/files/kojumifejox.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/jabet.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/87632596592.pdfIn PDF document text
    • http://demkapi.com/resimler/files/muvafo.pdfIn PDF document text
    • http://mgrima.com/files/file/nodatugoxulariposoporen.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/27751637713.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/25280648464.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145379c2be84---sokulurude.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16150469052e9d---vivawifusi.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/nllnv3mvlidtnvqkh45jaonvht/7126421267.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/kojewopufizawos.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d75a862f70---10437316739.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/xedumarodukilamonalesi.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/26948050438.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/85056581828.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/nogedefowadak.pdfIn PDF document text
    • 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_off0000b032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB032 15960 bytes
SHA-256: 53baf7e221dc1aa2d08d4da537e9c0d6ace82b884ae76b6c0dc1a77ce1d54a63
font_01_sfnt_off0000d853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD853 10472 bytes
SHA-256: 00ab9fc4db05306e965f11f0e4ec5030cd786a5b8e1a04e0b3e95b57209136fa
font_02_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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