Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4df421035ddc5de…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 18:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7da112cb23179f649625e85beb817d62 SHA-1: a98f7d9038960f6707e02c92e9bbe7bbd7e351ad SHA-256: a4df421035ddc5deb3a3cd25d9e5849d1c51aabb907a53dca185c3d13672b786
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common tactic of using documents as lures for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=pizza+id+unturned PDF link annotation
    • http://julianina.de/upload/file/gofor.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614178612d47b---nekubanuvari.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/37531376389.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/gojaxuwezovuben.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/75571444968.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/67333471429.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/21884806482.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed88c51ce8---nosidebazofibeletawu.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/55886780117.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-16/20210916185826575042.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/39610879139.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/leriwuzafovi.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/18411750278.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/66273792380.pdfIn PDF document text
    • https://kimcert.com/E/file/18527700883.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/60786991555.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/21433197141.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614090ede7a35---vumizabodoxukidubavobuge.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/68754658349.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/duramapudipibumopoxix.pdfIn PDF document text
    • http://zerosquareonline.com/file/76519461842.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/87359837647.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/sasafixujixebawuv.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/pasomojifewekogalekume.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613594a6800f9---19483941774.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_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 10068 bytes
SHA-256: 73fbc41408a28aa0b145f500a3f69fdc008a5b39d5bc8defa609dd157138e507
font_01_sfnt_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 17864 bytes
SHA-256: d8f89f8a58fe2439682122a894bdd6672bbbbdb18b5a1c51aa6f71e23915c549
font_02_sfnt_off00012636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1