Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4cd27202fae84b…

MALICIOUS

PDF

88.9 KB Created: 2021-06-28 23:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79771c1ab1970ee1bcc704b647fa4210 SHA-1: 7f175d793bc1552130fe7c39524da404981b9d0b SHA-256: fb4cd27202fae84ba7edff8d4dcae304efd97b177bed1c45d398d249af98d5f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress sites, pointing to numerous distinct hosts. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/d769262faa2798378442d1dc298968e7/demafabunepafa.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bdf66f85e---45331543812.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609747811048d---48428200310.pdf
    • http://assushop.com/userfiles/assushop.com/file/62903399216.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/dcbd7b78638c7eb070720eff607c6248/tuzetoxez.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/6f6c604109537f9b8bb0ecce8478fb0e/konizu.pdf
    • http://qianlong99.org/ckfinder/userfiles/files/56177293300.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160753193bf6a8---876344584.pdf
    • https://rybczewice.pl/userfiles/file/44780678080.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1b611a2c3ad10199479a67b65e59301b/buwawu.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/zeduxomefuluse.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc789b09a8---9571092771.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c307f99766d---43645085074.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/32505171b84ddb5ce522692cdfd9ac73/79820113096.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5f1891150b686a90f9cca06cdefe439a/69694967128.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b17f1cdc21---mufunetezisodanud.pdf
    • http://cancercareresearch.com/userfiles/file/45632020992.pdf
    • http://desagresbrts.com/clients/34568/File/belekukagikenok.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee8a8f40dd---kokili.pdf
    • http://sport-way.ru/img/file/57470503409.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/r3u68kpa80bb1nsbcftbuvj79k/vozomepewozelirifibosozix.pdf
    • https://argumentua.com/i/file/pofepebomed.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a583eb57ea9---36600021273.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/ujd8b3f8e4essaoketa0p9rs8f/jasetofew.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3152a651bd---33495089657.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761618682da---4720775882.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=braised+beef+belly
    • 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_off0000eea5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 16792 bytes
font_01_sfnt_off000106b7.bin
05b3a6c50472435c87e44a393a6e98b04da0f35e09e0fc84ea1d9811989fabe5
pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 17248 bytes
font_02_sfnt_off00013350.bin
1cf1e4bef267d1206c84675eb4f2135e7f22bf13fad289ac7c9b1d82887c2abf
pdf-font-stream PDF embedded font (sfnt) at offset 0x13350 10332 bytes
font_03_sfnt_off00014ab2.bin
ab4a193cdeadf207f1dd8d14794debf29f859dbbb14bd2b0725036b9e27d7416
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB2 2244 bytes