Malicious PDF — malware analysis report

Static analysis result for SHA-256 0664164a5091a1ba…

MALICIOUS

PDF

94.6 KB Created: 2021-07-31 02:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27e580bcac75ea032e1d8f2555805b24 SHA-1: b28020cb65e40f90fc8d45b04cf94253d958fccc SHA-256: 0664164a5091a1ba611a57baf6ad35f8d3f5db64948b120750e84271c56f1f1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, likely serving as lures for malicious content. No scripts were extracted, but the presence of multiple external URIs suggests the document's primary purpose is to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://drafthe.ru/uplcv?utm_term=livro+mercado+financeiro+pdf+gr%C3%A1tis
    • http://jimmartinfamilyreunion.com/clients/35696/File/89267792821.pdf
    • http://ketnoikienthuc.com/upload/files/kavemodusukisudipulegesi.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075959b5563e---39951042512.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/letkpmh4g18bbm7bg9gtjhh1n4/bosejij.pdf
    • https://viessmannboilers.ca/fck_upload/file/segile.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/zamagusak.pdf
    • https://caffedisanto.it/file/xefeduwamatexanifuxuxof.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ab7f2670f349f6962777c8736dafef49/wijofexive.pdf
    • http://elitakhealing.com/ckfinder/userfiles/files/vagedatajejilotuwanob.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160854daca125f---6469357821.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a48c86c1ff---tavuxonaxel.pdf
    • https://himalayanthailand.com/image/upload/File/vesarozesimiwosetota.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83427901df---vufifazon.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607059d38886c---retoremuzu.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d611a50260---botizalokanukapowejesepos.pdf
    • http://mywayrtk.info/userfiles/file/55492926317.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad57d4ddff---88812464011.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/d73885e0b0c3b87067e2b189cb1dd4fa/72676239864.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3fb291f2c4428708df7a80af9504b308/kikevepuwafir.pdf
    • http://mylodge-naoshima.com/riwomanerupiwiz.pdf
    • https://exlite.it/ckfinder/userfiles/files/jazep.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/pq3ud1grjmg56h1bnr9j1t6np1/40993979178.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bac4953b4---sofewubikibutoga.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5826509f93---fofiroxorabovanisix.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b13ee7a20---vefexem.pdf
    • https://nnt52.ru/userfiles/file/puwilulogok.pdf
    • 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_off00010909.bin
6c39633a689c22ec90c753e62cd355ca3e2493cc153afc1503bbc8f6eae416a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10909 19148 bytes
font_01_sfnt_off00013786.bin
5148f560c49b2b80659020c2f8ced04d43dcad044eb0e821b9da216d7fd6c6fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13786 11120 bytes
font_02_sfnt_off000150e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150E8 16792 bytes

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