Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b91fc7332aaae66…

MALICIOUS

PDF

84.5 KB Created: 2021-06-28 06:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a78a8cd11e7706e87879edfaf151de7a SHA-1: 1e000a5ec2c693a5efb9aefcfc5f199a5a51927e SHA-256: 9b91fc7332aaae66e40da5bcc7a75f51d989721658511b29f124cd55b12c51e2
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or use link farm techniques. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using such sites, suggesting an attempt to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb901ea391---81278734044.pdf In PDF document text
    • http://huerural.com/uploads/image/files/91929114829.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/31841707234.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/metonojojaxakexesa.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855d7e72395---52672474113.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/24528035112.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/38ff2d680e7c81faad8c6d4bd2c8e62a/47068574429.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/49d355q3j7h8kth475sjf185r1/10833978181.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/nedazetafopijidamevarisi.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160882def34130---wavut.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/7omltff0kpn3anvvmiftmeuahh/14458558264.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c2f25685f21e070281526db49d5d859c/rodadevusofilowa.pdfIn PDF document text
    • https://businesslife.com/content/file/41362212131.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/77626916686.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/7b5d902f5c65e0e44da27f45d631ac3f/46979733830.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/80820342415.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/f035af42d7a21f48e9534a64793e1e91/foteminofuvidibunosi.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983ed3079aa---66026613639.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/73531597689.pdfIn PDF document text
    • https://amblamy.ee/upload/file/galirojudazamunoduwesabep.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210624023537.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/55042394361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=tight+hamstrings+and+knee+painPDF 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_off0000ea2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2E 16436 bytes
SHA-256: 2265a913eecc9534969a7518d59a3f19dbaa751a204f0885ab90715c404ce8c3
font_01_sfnt_off00011463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7A 10728 bytes
SHA-256: bbccc077b0f65680d95750a4acc7bd003fc7b4ae0866e2436a4dcf674d2029fe

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