Malicious PDF — malware analysis report

Static analysis result for SHA-256 973f13e420354e63…

MALICIOUS

PDF

93.2 KB Created: 2021-06-27 18:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2813bc40d17bcebcbaec36153db14d7 SHA-1: 0086d2a5b5201a50b44919ba48af791d9ec4b560 SHA-256: 973f13e420354e639724a1cab67b5167f6ccf1c92870b3148809bbda0b0f66af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/psdv0ehmt4ard4ke8l6qb3n6gr/gimaseperalujisowamog.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/382533f3aa74a72ca634f562159a8713/wibuwarifonodid.pdf
    • http://jonmechina.com/ckupload/files/xonafifaberatu.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd5b0b675a---57283986352.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763e3a93d40---68658835853.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/fevikojuxi.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e129319e2d---75918070727.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/934ea1feaab0e709cc497712fa3d43a5/71544294647.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/6941dcd6bf64fdc7a848a6c955aee789/ramijepawonitanexibeg.pdf
    • https://drrajanmahtani.com/userfiles/files/govavidinafefilupibodukan.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160841a9280b8c---93061058434.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160815541afd70---nakiverozalinos.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/de7ec4bdbc77cc2ae07d49ce3c26877f/9098552180.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099b83384a3a---tibole.pdf
    • http://aihyang.com/userfiles/file/fivowekemikagexinam.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b617a3b11b0---velisego.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16084ffe4700d0---fumimugogijukuxo.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/d8594482f5f4f1631772d8b6a7a8d0fa/99287172234.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/cbbu80350iv0rhmea9lq21stt5/71965886106.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c282e104efa---69888790168.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cccbb3a867---mabedodofe.pdf
    • http://flirdining.com/uploads/files/30342651635.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=scripture+about+praising+god+in+the+storm
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f14f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF14F 16792 bytes
font_01_sfnt_off00010961.bin
45eabb011f8d23b24baa2698eed757bd2ae507fc54b19dfcfb1ee9c30f27978c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10961 17120 bytes
font_02_sfnt_off000135c2.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135C2 16312 bytes
font_03_sfnt_off00014bce.bin
85543c6611d9a18fdc26c1c061b83cb7e9bc920ebb7f942763242754819199c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BCE 11228 bytes

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