Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca7f748e5017d92…

MALICIOUS

PDF

76.3 KB Created: 2021-09-17 21:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7936cc372293719dc9fddaf61596b2fe SHA-1: b4a02ca3cda9477f831ae9b171b99a0b8340ef11 SHA-256: 7ca7f748e5017d920bc9dedf49e197e76d5e14e7b861bcb65b133a161e01ddad
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document instructs the user to install or connect with a remote support tool, which is a high-risk action in an unsolicited document. The presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggests a phishing or malware distribution campaign. No scripts were extracted from this sample, but the overall pattern points to a social engineering attack designed to trick the user into granting remote access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://chcial.ru/uplcv?utm_term=any+desktop+apk PDF link annotation
    • http://tractortools.cz/ckfinder/userfiles/files/rikew.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/27641097639.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b67faa61f---labuvuzusuz.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/vaturagubewuxorupafevazer.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/6bda072a607496b3174664d2abbb7531/6344692017.pdfIn PDF document text
    • http://xsteelstock.com/d/files/84803740514.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161368333e51c9---vorixegumu.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/nofavaposogojediwukexapo.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/2812785905.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/0nkopg8m1dvuij63eds36peg13/59946052271.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/92017090790.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/liwokuka.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/62648237489.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/91853841756.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/busudoriponapogakirez.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/23777505671.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353eab95321---pedudajapajokabukigarixef.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/41808528597.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9974bd500---gilab.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/25330592549.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/76607015969.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af35cc1df0---75139354926.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/48341967273.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_off0000c985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC985 16468 bytes
SHA-256: e3903f05a1ea0e613d8fa8edcdc0851d34785be53a30f88965649b6624c41b13
font_01_sfnt_off0000f3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 10332 bytes
SHA-256: 187aa4f1c7155e33c36e3b2f5e638f145b100b066131ae63796e1272cc3f5032
font_02_sfnt_off00010b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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