Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a3d10c502001d1…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 06:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 335ed03a3c88ece4af1dbd1b3369ce74 SHA-1: e65ee3e7289fecdb673a8a39c9c478f84001581d SHA-256: 25a3d10c502001d1dd0f4a4857c271e5f140912693c725a6efaf59080dfc256f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://pixomot.ru/uplcv?utm_term=random+video+call+apk
    • https://odontologosmalca.com/images/userfiles/file/76565920822.pdf
    • https://hunglivet.com/uploads/files/202109111525543654.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d7cf7c0d8---fifimewexagejebokotedofog.pdf
    • http://hani-bee.com/userfiles/files/ravawilorexuri.pdf
    • http://mdtrend.hu/files/file/jalebuxamupuwemifibuwepu.pdf
    • http://superfishinglewood.com/uploads/files/15964826768.pdf
    • https://balarampurblock.in/ckfinder/userfiles/files/fitaguxi.pdf
    • http://angarakshaksecurity.com/userfiles/file/piwivubexi.pdf
    • http://huseyindurmuslar.com/images_upload/files/52028933650.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140a11bbcd43---kovuvevuxuduvipexugi.pdf
    • https://vasantviharproperties.com/userfiles/file/43070417905.pdf
    • http://rucodelniza.ru/userfiles/file/saregevidosanadolex.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161402b26f2fea---bizukevumadutemaniluvi.pdf
    • http://dorp.pl/userfiles/files/fotipojafor.pdf
    • http://1yunnan.com/ckfinder/userfiles/files/78000518145.pdf
    • https://acavacecio.it/userfiles/files/xavuramiji.pdf
    • http://prtourusa.com/FileData/ckfinder/files/20210913_49B298A262157162.pdf
    • http://tyextractor.com/d/files/virivemasakakum.pdf
    • http://energy-labels.com/userfiles/file/deduropapogovapegovulevib.pdf
    • http://gavionescodeinsa.com/userfiles/47859813419.pdf
    • https://lean-ds.com/upload/editor/file/35977859606.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/sibelofubepetoraxanig.pdf
    • http://studiosimonepantaleo.it/userfiles/files/55925369601.pdf
    • http://e-sportis.com/images/upload/71586347401.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1e4a8f453---guradipuzosasideve.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d7.bin
3df406f172ba297a72802cb02f7d14b88caef9696004a28bbf13084c6195fe30
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D7 17476 bytes
font_01_sfnt_off00011502.bin
a1fa2012082723c191b2cc04189870bbcaf5b0e5738025b7a3e1efb7c1a84e41
pdf-font-stream PDF embedded font (sfnt) at offset 0x11502 10512 bytes
font_02_sfnt_off00012cda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDA 16792 bytes