Malicious PDF — malware analysis report

Static analysis result for SHA-256 61deadd2e149a900…

MALICIOUS

PDF

83.1 KB Created: 2021-07-05 03:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64db9252ac972d9b61fe0793267be6f3 SHA-1: c79ba8c2e381e09d1e2d427eff9ed52ffc60a638 SHA-256: 61deadd2e149a900984b6fa9d2b3f63e5ce7d926034a2b3425179d3f3b88a551
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct hosts, many of which are compromised WordPress uploads. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://arbormaster.net/uploads/files/fisakereralagusipavajube.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/8fa754b94147485e348e87ecdf238458/86549771966.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afb3a45c547---rofigepa.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b28119fb51a6eb78bb826a2187a506f6/kolewuluzoxowovubone.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a5a532aa4---vuzidazunolesatexovavixu.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5fbb954d7---dulixefajekabawugak.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/churqpjph0npm44ngk3k4mqdar/juliwenakedomasej.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/548fb39b3962909084285bb8dbdfb834/vowafiramozubosovo.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c37f64e235e---80454313849.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/8c8i9qrhr4umt41kppiueq4051/88094792126.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cd26ebf7e.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/lclv5fu3l0ibk91kk1abnqov91/11970217811.pdf
    • http://alexhoffordphotography.com/temp/files/file/zutofodurexopunokikavi.pdf
    • http://peaceinsrilanka.lk/userfiles/file/getulikaxutuzalukevani.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd4acc96f---94626200568.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607019efa5cd7---21868346300.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/87551843240.pdf
    • http://ikkosushi.com/uploads/files/112132018.pdf
    • http://wojno-stal.pl/pliki/file/11325435900.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abc80586af4---kudujuxuzekiposewodaka.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/ffdad795ae364bf5384e6dde57cb9d98/23362445839.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/zipufijamelukixosenoda.pdf
    • http://suacona.com/clients/16856/File/33893684687.pdf
    • http://zoltysnieg.pl/pliki_wyswig/files/16188259383.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=mystery+graph+pictures+printable+free
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e14f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 16792 bytes
font_01_sfnt_off0000f966.bin
9e70facfdebbdb55887deff5560c5cce842688401698ae5ec8ed07ad37b28b87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 10984 bytes
font_02_sfnt_off000112a7.bin
0fe83719979f2dd81ff412c5e207bbbfceae98401e2dfb408aebd603459a05c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112A7 16896 bytes

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