Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50d26ad76be6da4…

MALICIOUS

PDF

87.7 KB Created: 2021-07-10 11:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d40f43127952bc142596bc01570b54cc SHA-1: 84e0f3f054370b55a8fc3678828ea48a8ef9ebd1 SHA-256: a50d26ad76be6da4a5344c4460cf3ca28c829dd1f2ac04deea4f0e93e519aaeb
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks. No scripts were extracted, but the extensive use of external URLs is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://krisoc.ru/uplcv?utm_term=depression+induced+psychosis
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/1dfekvhd5vi9vl5vkee8dak9ro/sawadonosugadiwonepa.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba54abdff80---56040926646.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae940fa7076---xujarodomowexexis.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a177927dcb6---debesolawe.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5829892fce636611807029543ae33cb1/bamekulatajogilinofipabu.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a77e1d6022---zevowegotovizif.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7672e0ade---fiziz.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079a7d4a8782---zonebe.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/68797097906.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/heofcbhgriosd893lp0tabhenq/41953814821.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/06ci7bhklcsr90c013k71vmcg2/33960366109.pdf
    • http://mosjob.ru/images/file/25522654388.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/63rr535i3tqf98dk8h5njdpfrb/76864801774.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6df250333c---bunamubesowafo.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607165dda031f---13888938191.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160986fce74e6a---takegazabiwemejavuviwugar.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/32d072a00f01e0904330db087019c059/25996980653.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gdlqp096b6j3flffk4s6qg7317/ladetaramezatuwi.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089796c8e7eb---famufikavifijumojazixu.pdf
    • http://maychamsocda.vn/images/userfiles/file/3280925301.pdf
    • https://netwindowvn.com/uploads/userfiles/file/28136455357.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e382a111e3---wubuxinabi.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070ea8c732fa---42066176165.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_off0000f5a9.bin
31862014293ab71f23d4eeb316b6625045452f340ee877015dd47293729e0f4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 10520 bytes
font_01_sfnt_off00010d84.bin
cf07509253eb26da467c44f435b0c8ba7a55c50c504915adc275044ffd22eefd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 17020 bytes
font_02_sfnt_off000139db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139DB 16792 bytes

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