Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1effff972ff243…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 23:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a1d005747bc3cfa61d309a456edd8cff SHA-1: d34a6babd65484caafdd589d848ddc9859b99463 SHA-256: df1effff972ff24308d694db5be696963e6a722a5a48d02694f636c6931dbad2
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external PDF files hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The 'Remote-support tool lure' heuristic suggests the document aims to trick the user into installing or connecting to a remote access tool, likely to gain further control or deploy additional malware. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://n95america.com/wp-content/plugins/super-forms/uploads/php/files/b5d3bd7e48e8a2221a4dab7ce932035e/pibawofo.pdf In PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6c7c70540---sizokutagulipemitanajivar.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/gepabuzasarafegurasovud.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e8506bf65f0b67731dc0b7d43f1e4670/gevugokamudapazonozig.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7a8258633---6432582361.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/72675663280.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/24253743488.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/88730124869.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070508d5c01a---62819483195.pdfIn PDF document text
    • https://digireg.sk/upload/9987891701.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a612b544c32---xalujumugejalanivopax.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/93322534010.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/zolinibevim.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/5de4b9b0779f25af4a235e3c1017b972/29945096469.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/8b21f6cdfa6eae62e9ffe407f52635fd/64863853862.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/52327486073.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/67481131136.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c10146de833---49705409923.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b446e3e0536---45598685978.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/jivexefibuzozipeg.pdfIn PDF document text
    • https://susta.vn/userfiles/file/popalarasiwujemesuteri.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/69355311904.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/gipux.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/q8f7dqtra1arkcpmfmq2k9lmgu/xitudodiwapemes.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/90672226306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=simulation+in+r+pdfPDF 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_off0000dd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 10532 bytes
SHA-256: ec6ebaf2413fbfb975da947cb2d67ba6f32ce5c39d21bea1ad6a5c01c9459266
font_01_sfnt_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 17876 bytes
SHA-256: 49078bc06d9121a556bc55dfa58119bf99c2fbe84dbd51817703c190ddeba010

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