Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbdc61d980bd73a…

MALICIOUS

PDF

102.7 KB Created: 2021-07-22 09:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fe6ec88b727421c8bf4cebaf2cfcbe58 SHA-1: 0391dee15f167ac2b6ea242e4182954d931bd4d2 SHA-256: 6cbdc61d980bd73a8c52d35296cd8cc6c9a4ee43933f910cff0e2beb01afbe24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e8b1e1868---40305566354.pdf In PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a5a77783dd6631bbed378269cc2150e1/12823520133.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/lidosifo.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dac285018bb---63294048177.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/vijogufuripezefuwodogemu.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608483b795fcf---71009447060.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9da96e88---padosepujijurataviwojagov.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/2vtrn9gpohthmuo8jl7q1hrndd/38957176199.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac311614b4d---dozesabidodomemajabaseguz.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c05bc7e9d8---10018574541.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/xeden.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b871ece4a08---ribivo.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160730e33269ce---98956241031.pdfIn PDF document text
    • https://bonacorsi.it/file/59362376983.pdfIn PDF document text
    • http://allasclub.com/campannas/file/82760978318.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160acbac1ad8ca---tevawoluduf.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/navizuwusuv.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/83728201451.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/pedal.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/mobifepaxemibizit.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/2224009453.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/3mh5149opgnp6t0krjikr2oed0/81082423021.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215201241195020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=death+of+a+salesman+quote+analysisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014cc4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14CC4 21512 bytes
SHA-256: af05d6e214d779070de21c89f30e8ace79431eccd78615acc64da9ccd6138df7
font_00_sfnt_off00010915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12127 16848 bytes
SHA-256: d73f51b25a75738288876d9636c9d26cf78cf4465ce8ab4d922bb25eaf4530f7
font_03_sfnt_off00017220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17220 10740 bytes
SHA-256: cf224c3d6feaf5b8f202404e3edb1935e9e25b1b5bbd4992a3b739c062280bc9

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