Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c17843f0dd5e0a…

MALICIOUS

PDF

71.4 KB Created: 2021-09-05 05:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 24309d5cc91863d76c8a892787fddd26 SHA-1: 4fb1ab6c4b9d2dd5189f8abbb72d6aa8d5b43e02 SHA-256: 40c17843f0dd5e0aafb9d7d7e73c5bafc1d01798c9d0dbc23d00825098020d73
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggests it is designed to redirect users to malicious content or facilitate further compromise. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cluboutletmoto.net/campannas/file/61515789362.pdf In PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ovlhal20okchl1nujbcfedtr45/66430101559.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/f1c5b2681b4996eec0a72dd96b35e54f/doxudatowutajamawojemoke.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/befegegegomubowezibugo.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/xidijezu.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b90a2c6b4---kunamosebamixijajuvabufe.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/50595809296.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/78281471266.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/73050002595.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/81jqo32l0v3i4tibqob39d9s56/91651566466.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/23443234945.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4a7i81j4nfnu7ev948avbhm84a/wipowibaze.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/74256935054.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c7413cecbf5---vefazadisogujikukile.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/sovagobuxolaxedowek.pdfIn PDF document text
    • https://eamenfaraz.com/cache/fck_files/file/salumopivapakodev.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/nalujuxemosawovekakurali.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/folamemamubi.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90ac98225---wosapukevezamiguvexuj.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec8a39aa5---ronarikeluga.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/gamatidikip.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16072b00d0be31---gapojitepevokobotaxan.pdfIn PDF document text
    • https://birudongker.com/contents//files/11384316702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=shanghai+cooperation+organization+pdfPDF link annotation
    • 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_off0000b847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05E 10820 bytes
SHA-256: a6adc9a34dadfd9b9e00e8419a852d014cb646ebde955dad1c65f9fbe395cdf2
font_02_sfnt_off0000e920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE920 15164 bytes
SHA-256: 587981ba49e95e174023b4d63ffa34167ea74915882aba0f7aac60428d75cfb2

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