Malicious PDF — malware analysis report

Static analysis result for SHA-256 e318d1c9d724f87f…

MALICIOUS

PDF

78.3 KB Created: 2021-09-11 17:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f957ced507da96df5186534357cee87b SHA-1: f9b81bcfdd7ac5039c1ba39bebc362fdeb4136a8 SHA-256: e318d1c9d724f87f800afda461016b923660f51af957991d8a000e4cb17fb18b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the final destination. The presence of external URIs and the overall structure suggest an attempt to lure users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/2974ae7931a9d5dab0a5e5807dfb3f0a/54620141728.pdf In PDF document text
    • http://terezszilvia.com/images/uploaded/file/kagurineketupujukisidow.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/xajuroronaxidibalukow.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/52780064061.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/liwoj.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/69178369253.pdfIn PDF document text
    • http://nktrading.qa/file/files/jegefidunamis.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/vafajekiredawetoxugewozo.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/90933972131.pdfIn PDF document text
    • http://regcureguide.com/files/files/sogifarirut.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/nuxafexuredizopix.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/jolepemavisorido.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210904171154_1981886762.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613745c172db3---disugiriwoko.pdfIn PDF document text
    • http://hagithanh.hagigroup.work/data/media/files/puwov.pdfIn PDF document text
    • https://hoalavender.net/upload/files/vazabiribifilonororog.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210909_131914.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/58903335132.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/jijiforokilomikoj.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/76441135361.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ada4bc1a00---20532374628.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/e92qm9pjkd4oq59vnuspgbc0b2/85572101017.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/36882460977.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/masuzeruxo.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/56179123219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+block+spam+texts+androidPDF 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_off0000cd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD67 17448 bytes
SHA-256: 5ce6b5b25626763aef72f8f8599e2fd72a73701c2cd81692aff5add3c1b64a25
font_01_sfnt_off0000f9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 11088 bytes
SHA-256: 3676c6ce46f0109c81de1611387943be3d2f5b2d7ce4e1211784e1ae9dfd4830
font_02_sfnt_off00011377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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