Malicious PDF — malware analysis report

Static analysis result for SHA-256 a786970d77682c5c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 01:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f7d59b05b48e5f1c66fd4c2536efcb33 SHA-1: a179e357fbda4bda007e260759b6eb6d40b87a14 SHA-256: a786970d77682c5c3a04c52ed0cb813a8c8022ed766f43de67970b44915c228e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the presence of multiple external URIs and compromised CMS upload links indicates a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=guhring+diver+pdf PDF link annotation
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/a1c95fe42b875ed8f0f2de3bc84f476c/45052915723.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6b49b1b5---juxol.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9964c658f---lobumusemidulodojopiwewer.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/fivuvune.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e75773f141---75087163758.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/76h1ql2pb2n2dd3ltos32e4du4/gatekebigenapikulojow.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7101c46f6---vukezofevoxatozowaraxiri.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa//files/tabonolizajasabutimetawu.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/78140736138.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/qlpkafjm8d5204jcnkfaqjge46/dajegunaride.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210824110156.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5cded620c---9102509670.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/77403194899.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c8c02c56c---68118788800.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/59549472582.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/juwusivibe.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/88689882323.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/528a7c04038aeffd15ee8e72fb89e309/taxoxemuragenisobekasebuk.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ouuofh7rp4nsaa79fk1tdp4tn0/16830436185.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130f1aadfdb7---12700844487.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/36047595562.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081738c35d8e---vixamodonel.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ad334b997---xawokojidorojijimunekeku.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/fb56ba0dd10662db2f3e51a6bd1e8bfb/66485354960.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_off0000d556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD556 10388 bytes
SHA-256: 5375715970b402c8b54f8aae4b9235a9dc455f722a1b12f4ef26162a14aa96a7
font_01_sfnt_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 19036 bytes
SHA-256: fcb0f2e47da95184639ae526b54c55f8cdc8e8561edf1fd61a03929abd54a667
font_02_sfnt_off00011e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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