Malicious PDF — malware analysis report

Static analysis result for SHA-256 97fba3e2b7143934…

MALICIOUS

PDF

91.8 KB Created: 2021-07-01 21:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c845b4ecdf92259d2878c26a3cbf1ace SHA-1: 4e8b5437459b330a5d1b78800858f77b75bf3b82 SHA-256: 97fba3e2b71439346c565f7d6602e94ff0aac27119d5d8799bf20d1fba5b7d30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate this is a link farm designed to redirect users, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8d8e91604---bixom.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9206dbd2c---41311562676.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/aff99cf23aa768b815b053aeb95f57fb/kewemogopulabu.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4639342368---nitupudepekireja.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a701d13c5---22846483590.pdf
    • https://argumentua.com/i/file/lafeguzujejatoboketixuzu.pdf
    • https://bharatbiodiesel.com/userfiles/file/telirapevejalaviwipogoxe.pdf
    • http://esoftland.com/userfiles/file/12767863175.pdf
    • https://bio-obst-und-gemuese.de/userfiles/file/17140038650.pdf
    • http://normel.org/files/upload/file/kufegizadakaxulopoxexez.pdf
    • http://www.deewanalarab.com/up_imgs/5858562964.pdf
    • http://onlineticketreview.com/images/file/dibewokaretov.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/8f5tn6iu6c0qe2ncmcnvhjisl0/10257001982.pdf
    • http://castrolmintabolt.hu/images/upload/file/20413146350.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/a27a48a093a5218846ed297be57bb243/rezigifob.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe1ed3407---povepigasujawuzozuluse.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a3a12a236---pobelas.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a960e0559d5---simesuza.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf1ef4fb80---limizetelorimuzadujosevav.pdf
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/48802334610.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/4733d16273b58f89aec75dba941bd740/sibozufot.pdf
    • http://savvyais.com/userfiles/file/44625485343.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/699173d7a74a3cb4cd4581e9aca23dfd/7339016686.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160903e69da621---41632541457.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/8dul0b4i29ph8tjftp8fupeonh/2209572057.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=inflict+retribution+for
    • 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_off00010532.bin
d5ff77939679f6c3b113f5761dbd4ba771fe20be2b8950bd030622851c4ca725		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10532 10192 bytes
font_01_sfnt_off00011c1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1E 16792 bytes
font_02_sfnt_off00013430.bin
aa1f71e58cef6bd4d69c9c09b6a82dbd02653c79277065562211550e6cb87753		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13430 17308 bytes

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