Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f91d18971ad6967…

MALICIOUS

PDF

102.1 KB Created: 2021-07-09 14:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b57c42579f0908c8a06bc814a4446021 SHA-1: 17debd1222d2842c75b0f146b461ed1b6285e553 SHA-256: 9f91d18971ad6967dc66eb6effa3a9202452c9ec9fbe20b1360d0299b13e5e4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to disposable hosting and compromised CMS upload directories. These links are likely intended to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 6

  • 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.
  • 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 http://kleinschaden.expert/userfiles/file/8498264225.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba4e7c8130---mijamikavogafigafunutuli.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160878f1539298---reropiwetiludod.pdf
    • http://thermogroup.ru/uploads/files/80486059808.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160984bc9c1fb5---13487052766.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/cd6ceac94cd06689c58e123492cef562/18636851204.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/5ed483b0a1f06cea832bfb0d162cc487/tijizeto.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608254f12b478---87224185646.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f64107c3ab---74612392472.pdf
    • https://sportnazona.bg/f/uploads/files/lojibikonuxu.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160700fc7d2666---48289431034.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c77ec9e5bf4---13860881991.pdf
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/jeburad.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609448140818a---piwupagujabodusu.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/ra4qu4dq2vfopfjpisleqrhrd6/wogobegarilolonom.pdf
    • http://mnogonomerov.ru/uploads/file/56531511882.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/7fd354faf04a95f97991011e28b403f2/93257054021.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/8a1d22430ea80ffa92c261f3cb5ef740/vigujepi.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/uv9acg5l7rs61mo9eob5k56aq0/taxavagoxizirazarobamofuz.pdf
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/33166653929.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160885c4ab714d---mamapediwodizegilerut.pdf
    • http://shannonlakeestates.org/fck_images/file/sawopamuladoj.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/nvbqnqr90u0qbu76jipjt47q5o/zegijisevavasanamuzus.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749fd17a2e8---43862475739.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=micro+chips+666
    • 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_off00012bcd.bin
12def13b4e362a7f9a65eed12f20fb8b253758f1d0f153da585237b007a94814		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCD 10088 bytes
font_01_sfnt_off00014263.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14263 16792 bytes
font_02_sfnt_off00015a75.bin
c8c06a62cd6c669cf136bd004886d7e3b981d389806c65e319e1bea15777e91b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A75 18688 bytes

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