Malicious PDF — malware analysis report

Static analysis result for SHA-256 5913536a5d8ba482…

MALICIOUS

PDF

161.8 KB Created: 2021-07-03 12:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 736f6248cbc9d48541ec544f713e93b7 SHA-1: ae4da2d042aec072650e444d6e3b6ca30b184e5f SHA-256: 5913536a5d8ba4823ee5e661593b65177167a1bd76262344f2d62279a18fd52e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://allytemp.ru/uplcv?utm_term=twitch+ad+build+s11
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2153fc8e8a---86940162388.pdf
    • http://sl-light.ru/design/img/upload/file/86857006445.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16093e55711488---larorobuwidaxefovana.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/251e6cc6de8e43e9cfd36c0da3c49921/85222619008.pdf
    • http://mwflower.com/upimagesfile///66348896411.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5178d1a112a4b01a6fa2cd902a626d66/50576582727.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e59a1c432d---52062590357.pdf
    • http://bpabv.nl/uploadfiles/file/19422628932.pdf
    • http://marketypik.pl/zdjecia/fck/file/97799853143.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160722d9c48e6c---58490326353.pdf
    • http://grandwatergatehotel.com/upfile_hotel/files/68897571198.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2c551b04b---wumaw.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d498f1431e2---83718512709.pdf
    • https://1877painters.com/FCKeditor/file/regititegupo.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/c049a84724f933131ff5b36e4bf2e3e6/45402483100.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/50912784.pdf
    • http://fd-health.com/upload/ckeditor/files/71309795321.pdf
    • http://pivotal-technologies.com/userfiles/file/93387838339.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/4q7tpacohdjmcdu25u6aqa6vda/48125216890.pdf
    • http://bpsstudio.hu/uploads/56878742116.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a0d103f8f---tikasiwuviwurenotad.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a32042a90---savegulul.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ihkk81hpvlti6hr2so1bt7rj4m/86280377369.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8361611a7b---zujovelokefozojalunevak.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/mn35ojgcagbhrmelm7u74l4384/pudisox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000219e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x219E5 16792 bytes
font_01_sfnt_off000231f7.bin
d3511b91bc6a0ccce83445fec7a9746aedada01f9f7f806e13fa262d57659f34
pdf-font-stream PDF embedded font (sfnt) at offset 0x231F7 18308 bytes
font_02_sfnt_off00026249.bin
06b30f6fdb0bc20e92d85b7c8537e859132626f6e40923a60b55db1cdcf039aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x26249 10352 bytes