Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b74e32f17a1ced…

MALICIOUS

PDF

86.7 KB Created: 2021-08-10 21:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b5ebf5dfdb58f4b4890e45e878de4ff8 SHA-1: 849f4a97f79f1d139e5267b8cbe5060ed2a753f3 SHA-256: 17b74e32f17a1cede1a55ccd8c1b917268442e7044a1903b3cc2c63458f69575
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, with the file being identified as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/pj7uakm2mt2cpn5096vlj7uktl/19968367363.pdf In PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/p1vahmu4v1t62gjnta9amqtit0/kupakanawerenedixuf.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/voverekepilalobuxobog.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210630163631.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/dfc1efb9e21b869ffc77c51f4442c920/71356860083.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/96095318280.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ad706cbd9---tagiwinujefurirapir.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/xavosubop.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/92074559367.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/82738933157.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/ranuladasapo.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/fofukofowifaw.pdfIn PDF document text
    • http://beateromer.com/bilder/file/59392029140.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/76100d29409892f6e59e6b438c7a514e/xaguwipedilosedenemekaf.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ujc2mb9uck08l372mt3pbpqbhi/80340321686.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/vghlshvs542bv1eals3kfu0fm4/rejisakewerebenimatazowow.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a47ba8e199---libugilalegujuxifavetu.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/wubozuxesudiwifigumu.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c7eb19165---vanuvulajurudofujesen.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/8c44a8880a79df3dccf33d29996e57be/15616180665.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/zoputudavodaxil.pdfIn PDF document text
    • https://anup.bo/images/files/xurezu.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/regonugovokobazotofew.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/gabagewefevaruw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+disassemble+a+nordictrack+elite+5700PDF 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_off0000ed91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 11144 bytes
SHA-256: 6ef93fea8ecd0a215b5f86350b08d7b6ca618b538147efbb62d8d6404b5f9e8a
font_01_sfnt_off000107ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBD 16856 bytes
SHA-256: c0b0013974d98770a880675c26ed669e5ba22ed32a8dcd088024ea53493c625d