Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0d37ec0aabd787…

MALICIOUS

PDF

96.6 KB Created: 2021-07-03 08:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dfa1bf0b78fa715041ed0d77d57f3e0d SHA-1: 33ddc4d436f864d9f6e7389f088c02cef1ca6dd4 SHA-256: 7f0d37ec0aabd787892c596918933fccea09ccf04186c3bfeef30549af590a68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress installations. These links are likely intended to lure users to malicious sites for phishing or to download further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://garglob.ru/uplcv?utm_term=another+word+for+contradictory PDF link annotation
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730352bbcf7---maratunosaro.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/25d6793b7ab9fa9f0693654b9aa500fe/60093871672.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/f2711e46ab34d5b60671a63b0b9019ed/52948043707.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/23550936390.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906f629c2f2---kusazo.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/0c5c96bb09a486f5f3882336d7e0ebef/kosujuniwabo.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608929578b22f---35082480629.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/zitunodisunuxon.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4608e03a3cf3a7528e201c875f7dd821/kasikotudukegoguj.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c0cd84734---72120749056.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4917f292dd---92422148900.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c761cb3d0---76653385853.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609be3f8041b8---vevolef.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/42906162582.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e3dd43c1b---47648155522.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/41md4o6g1cp6hpe54uup9s6phv/32420590141.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4026f9f767---49661684320.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2fbe8d1c7---88724834194.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8c52f1c3e12d8774b03acad197ad4781/turuwuzurisiwagu.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/29043497573.pdfIn PDF document text
    • http://renovator.cz/files/file/nopuritavi.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b4e1ac6ea63bcecb0eead753343c0b56/xorexagalexow.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cec9fff0a5b---59007311924.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebf150cd43---36137567394.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 16480 bytes
SHA-256: 584e72c31b2fb4c1105a4fdf7b0e4fa42d5437a5e1d5f42e3f3a430323461c42
font_01_sfnt_off00011334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11334 18388 bytes
SHA-256: 315e37a0deacb3871141877f00ee7071be41ef6392028afe5db48d44202f9154
font_02_sfnt_off000142ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CE 10540 bytes
SHA-256: 40073c6b50661251d90127d3de83c79f95862e083448493ee9cb1dedefdce3c9
font_03_sfnt_off00015ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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