Malicious PDF — malware analysis report

Static analysis result for SHA-256 57072ee0ee2723d0…

MALICIOUS

PDF

90.3 KB Created: 2021-07-16 18:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 45d9b9fffeeb777dcdd2601218ae6bae SHA-1: 0d831b9b192bb80677a9472c6ddb9a89f516d51f SHA-256: 57072ee0ee2723d0788df8ccd602afa8a51e2f897911d141ef9d283e735109ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious files or redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • 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://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b4c770ca7b0---voziviperewewoduj.pdf In PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/04434ea94f206bafb93dbb3f07c33e66/70715168727.pdfIn PDF document text
    • http://buildinggodskingdom.com/webcms/file/19097016995.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/jarefidobuzu.pdfIn PDF document text
    • http://exosushi.com/uploads/files/povofovilis.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608182e71f216---67761499121.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41724a1e6---saburixuwunalodidojav.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09e1d4ab6c---11622158980.pdfIn PDF document text
    • https://bdcomunicazione.it/file/50713455106.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d222425c2---xejoxabenasalakaxaz.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/paber.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ee0cc5e9c---kotikezusalexaxemodigolun.pdfIn PDF document text
    • http://liberty67.com/clients/41815/File/nozisipobapewuzu.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/jukugamibi.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16091e279d2d53---zenabivosapopuda.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92d2520759---xofubekizibasesijigomor.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/bipawanalemajafudawevamop.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d63a4c2d1---tonozoxazerugib.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c55d7be54---ledivulimubuwajirelokod.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea0f9633d---xemerazuzojovovabazaloge.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/buribunalexevumu.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607c282b1f8ee---49796965554.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/mazin.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/raxikagofude.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/175e6733448226498bd5fd7eb2b9970a/12094061891.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///60287398067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+does+grass+seed+need+to+germinatePDF 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_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 16672 bytes
SHA-256: c5cb13c607084428e7902b73ae0dc8139e5258b02aaa638cc9490054531923c8
font_01_sfnt_off00012b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6C 10640 bytes
SHA-256: 831d6df152476410da30aba944ffdbbde0c7a12e2ee767de7bedad271c360a03
font_02_sfnt_off00014366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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