Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a66b131958ca193…

MALICIOUS

PDF

98.4 KB Created: 2021-07-01 12:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 434fc93e09b28d548bc9788da8880a9f SHA-1: 48f22a6a9f1ba4c59e901769f3ea4342cd4e44e3 SHA-256: 4a66b131958ca193a348c30fd813739426920cab9f21a07d1fbeb85fb446081a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, a common tactic for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://burgas-remonti.com/userfiles/file/64306364133.pdf
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/dc1bab740cef8980ced2f10963965c31/wojurolelavezakaw.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/52d936c6cdcd8ea44709465d3ac8a50b/25631356847.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160899700b679d---51680063115.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b40178edd54---xuwuzoliga.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/f7230b7d868c2eeb30c786517b90a2da/meredixofusu.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609e05f8497e3---luzubefelewobuxenukagap.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef77c2dc35---waweboputafu.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/dd77n1eol6sf7b76de9j7rueqt/lirirupurofavenudu.pdf
    • http://ladakhtripmaker.com/userfiles/files/81557004547.pdf
    • https://xlspandoek.nl/userfiles/file/bovozikutixe.pdf
    • https://yingzhaoliuart.com/upload/file/8097069852.pdf
    • http://ifa-astrologie.de/userfiles/file/93360890565.pdf
    • http://flatadministration.com/uploades/fckeditorfile/56899043325.pdf
    • http://criollo-cocoa.com/userfiles/file/garekijamakusitijezali.pdf
    • http://voszveszprem.hu/_user/file/kaxezagijuxireranoto.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09ec3346bf---fejobopimi.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/f0f4e1f1cb5a0ea6081153d2b75716b7/fejojogisufawujatiz.pdf
    • https://accuratesearch.com/userfiles/file/88258188215.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/cbfb8dc8e3517270fe4dc3b233effe98/vekumexuborapodir.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090d4831e1b5---gidozesiwajikemusiwunewoj.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/17107276223.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/2du509miqibfha9jv750q90pr6/lapizize.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=service+quality+in+restaurants+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110E2 16792 bytes
font_01_sfnt_off000128ef.bin
9268183401bf9c3352e4e2047b082c92e0ade90a534227375d072c1ffa8e8f11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128EF 2720 bytes
font_02_sfnt_off0001349a.bin
5dca766f18984256818436fa3d65a3ce45f21ae13b10f25b3433fa6868e28ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1349A 17488 bytes
font_03_sfnt_off0001626e.bin
9de5868faf0b3b4c9032388123c1f67f0868b34b68fa418837351ededbfed785		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1626E 10992 bytes

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