Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6a6ab00f314202…

MALICIOUS

PDF

84.8 KB Created: 2021-07-08 08:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 319d9ae3354ecd8f29239db3ef8b1e72 SHA-1: d63560db21294b7a4ec6ac9679947a6e80add854 SHA-256: 7f6a6ab00f314202b4f59f2e40ca858306430fabec7054fa7c8629fe1e7b41bc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and the presence of multiple external URIs indicate an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://otvorene-srdce.sk/userfiles/file/begijufijoroxaxudosirup.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c07638e79---97544137555.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b5683a18ad7---2445798965.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed2eb1ebc---difewoduzinodobewovo.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d5e39f59b79a3806b0259604147500c8/dikofuzesaguremazuj.pdf
    • http://msinziniering.com/userfiles/file/70980271363.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dec1f2f645---miwowupat.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb8cf5095d---gixuzumagisesopadawuruf.pdf
    • https://recapress.com/ckfinder/userfiles/files/dumofororuzaboxeku.pdf
    • http://adria-ex.com/images/blog//file/siligesatimixaroru.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c25cc7716a---897108860.pdf
    • https://pecsikult.hu/files/file/lokowesapo.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b4642e58f---nigivoriworusitem.pdf
    • http://nusratali.com/userfiles/files/zivetapesovofezulugebevo.pdf
    • https://olivier-daulte.com/ckfinder/userfiles/files/95482273655.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/32917792941.pdf
    • https://alternativecarrepair.com/userfiles/file/zosanuxexepisodosegos.pdf
    • http://ordinate-ltd.com/file_media/file_image/file/murafewabafenumi.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a8255a96b8979b69516d4f03d05032bd/fabexatabekato.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/npsnrfg8tm7nk1hm3l0nolublh/16439190540.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160bb297fb2602---zaxedaxa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+delete+message+instagram
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/086ec505130f234085d534917f2e0aea/92091186320.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_off0000e9d0.bin
39662e105895f3c633be73bbbd5d9a1a92a8082cb19dff0039a1860513fcdcc6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 10668 bytes
font_01_sfnt_off00010203.bin
31c9e35bc5c991779272afbad15c5669df0ed934e6f0bd9dc5488616a47e3f80
pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 16964 bytes
font_02_sfnt_off00012e4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4B 16792 bytes