Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8abd5f9aafde46b…

MALICIOUS

PDF

80.3 KB Created: 2021-09-24 12:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a711e6e02464aeafd0513d0dd10554ba SHA-1: 2fa20eebfae88a754dc5e65e43aec8302113d74e SHA-256: d8abd5f9aafde46baed91e9e2ff345d51d593f777280a2705c8c28872e2ced4e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links indicate an attempt to redirect the user to malicious content, likely exploiting the user's trust in PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=messenger+keeps+logging+out+android PDF link annotation
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/fexijisepobok.pdfIn PDF document text
    • https://dafelia.com/files/44635738200.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/misogidapegaxulofobetib.pdfIn PDF document text
    • https://izr.fr/files/fetasasedomezebijokasiji.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/29357563894.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/29434740868.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/kafuzamajosajizowuboj.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/56040737314.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/3rh0k16eq130rvi3mnte3eragn/nezolikuzasikatadonoza.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109041126324945.pdfIn PDF document text
    • http://pronobile.com/catalog/file/ruwirilalolakipe.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/38148312287.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/femanutigupamufopux.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/3477108719.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613606e90db83---82320842426.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2bdd0e192f25661fb81398d41e577fb4/48884626748.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a39c8c61f8911c0a34fda6109a69888/26945685350.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/tatevobipewe.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/66868487379.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/68410689107.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/xudulawuleraniv.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///94421311112.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/worajebi.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/nizajakadiz.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_off0000d61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 10752 bytes
SHA-256: c536fae0691ac60e9f280b8b0b12124f1617df8a68a4f05181265709da04896f
font_02_sfnt_off000106d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 17308 bytes
SHA-256: c0f42b7be7297ceb23ac0853eec878c247636ded459ce7d054554f74b9d77138

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