Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6fb538c672a690…

MALICIOUS

PDF

71.1 KB Created: 2021-09-04 01:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0124b5481ee04013e69accd09c23454d SHA-1: e0ffe5a92f524f340f07aacb66709c384341da37 SHA-256: 8a6fb538c672a690e360e2543dc09733a894cf5fd72a5e7cf63aa1efc182127e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further payloads. No scripts were extracted, but the presence of numerous PDF URI heuristics and link farms points to a distribution mechanism.

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://infrive.ru/uplcv?utm_term=ryze+tello+drone+user+manual PDF link annotation
    • http://mawaevents.com/uploads/file/juxifulenaxasetug.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/vugazafejotukavudag.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/vuxiruwojafuj.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084264d382d2---fevab.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/94213343643.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/botuwaxuzifozitozaluvazon.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dcf5ee4cf.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/50530194810.pdfIn PDF document text
    • http://artospace.com/pics/file/fogewebozozutojorofow.pdfIn PDF document text
    • https://rajaunited.com/contents//files/jevasoxojajoditudiwox.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/5b6de7767d16d612884bbd298cfcec48/18119444814.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/d6dbd5j18hc80cj1iujispq000/90083214367.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115e5e00485d---meruluxonid.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b8ea8e0fb---wipiguvabamigin.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wozobumirixidik.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/24138935356.pdfIn PDF document text
    • http://chinazzjx.com/d/files/sexewoto.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6f3cb3f3d---mosazi.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609646d4be939---mozebojib.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607534d930c27---1447021391.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/79055998360.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/bikuvanozedufekupoba.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/41754225348.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/98544217649.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/cd5b96eeebb60cb95b2fa941dd0330b9/46023113027.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_off0000b5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EA 16436 bytes
SHA-256: aef3bce9e7849b43e8d7fe9df252c61ae3ad0494618f6338437becd2b14e7399
font_01_sfnt_off0000de0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0A 10636 bytes
SHA-256: 93a42dfdc8149b8abd9ca8d895854d272236c8835df08861de9d011eaf20662d
font_02_sfnt_off0000f67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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