Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec78fa2c8aa43368…

MALICIOUS

PDF

86.5 KB Created: 2021-09-07 00:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: f636a22c77c092b7be6d000feb03a14d SHA-1: b05e678bcfe1738f4abdc5b3f0b46e62d01a1564 SHA-256: ec78fa2c8aa4336841d33c2bb99fb29f45d740b4070d1db80b2c1ad0bd64e510
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2eb195cdc---30174258203.pdf In PDF document text
    • http://intproplaw.com/admin/uploads/file/fipesojibuliwitaxe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dc13966f1---89522025249.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c68fe3b9fd2---29604591377.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/kavevadodo.pdfIn PDF document text
    • http://jp-cable.com/d/files/jifemujozupuw.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/ledowoxibolup.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/96528725387.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a534cdb805e---gibimagagisi.pdfIn PDF document text
    • https://haidangpc.com/contents/files/61986826550.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319b9ab7c8c---81122650121.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/13828229139.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0c8300ad---suzenijawisok.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/93936690679.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/tokitomazafide.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf28b987e0---zapuwufakodanegonon.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6df7ab34c22742e2f54c410b9a92917/samudiloxomu.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/53870084082.pdfIn PDF document text
    • http://yanartextil.com/firma/files/66150432225.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160db4eaad9326---83134643539.pdfIn PDF document text
    • https://carlojans.com/cms/file/52137214338.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/cc7d7a5e5c02f95ab521cc4aa2c1f6ef/kopabopusuvirujem.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/85597527919.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/nejujazinagixusov.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/71234254925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=why+does+skin+wrinkle+in+water+reading+answers+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_off0000e55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55F 11064 bytes
SHA-256: 71cad386ede4e8819fb49a802e63c398757876811795df5adff68cf63436edc3
font_01_sfnt_off0000fee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE9 20864 bytes
SHA-256: d9e0f48d070425ab4e0c81d484bff528f7eb5acd8cccd8f33ba41c14eaa70e9a
font_02_sfnt_off000133aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1