Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7de375c7853005a…

MALICIOUS

PDF

76.4 KB Created: 2021-09-04 09:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 22d0b0007b1aea63365a26f8c2da46c7 SHA-1: 3f1f25f7eefc071ba8ed47559966a5418b5e72db SHA-256: e7de375c7853005a40b465d25e968e120fbff6800e51b910fc4da0aa10cf6b77
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, which in turn host other PDF files. This pattern is indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://srldirect.com/ckfinder/userfiles/files/pikovosopije.pdf In PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ed2104f9b9b93220ff82c21d76d432c1/97857819984.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/kowovav.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/vqavs7ducd45lh782hsktgs3b4/2227223710.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/224252f9068f237c52ef73f51f79eabc/jexajururakadoper.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48f80eedb---siviwipogime.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/senubiwalar.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/xeniv.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/5e6e1248e2d51da04d30b23371c4a075/36779194740.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/94e6cb86c360b68e587c438b32c5b780/81977757403.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160717e422ff4d---lelogavezipoji.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/mojagoxixololawukexegem.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/7660157861.pdfIn PDF document text
    • https://hse.tw/upload/file/44506862116.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/rawikoxulu.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/lexuxuxivugix.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/15133220115.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/legovaw.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/korutubitigixagu.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/29429561816.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/sabudaju.pdfIn PDF document text
    • http://mousike.it/img_ins/files/28153759599.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944a41ecce5---55464707849.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/regezuj.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/70821013305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=darood+tanjeena+pdf+in+urduPDF 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_off0000c547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC547 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 10508 bytes
SHA-256: eb1ee00693922c1c806c76b5baaabb9ffda4773a2b5ff8ebdcae7e164e4dedb7
font_02_sfnt_off0000f54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54F 17904 bytes
SHA-256: 1146e871aa277f943b424f83c14af6028692b0bf5ba2ab0e32909d8037c2397b