Malicious PDF — malware analysis report

Static analysis result for SHA-256 f701d7a14777f9af…

MALICIOUS

PDF

82.6 KB Created: 2021-08-26 06:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a26c3f9543adc4a21cf25070da4afb1 SHA-1: 8af1db83a4910c780ba60e7ab874de419b6df742 SHA-256: f701d7a14777f9af5e9f7254a72563d02bb4ce4ed13b0ddfa7db6f075fa2c00f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and ClamAV as malicious, indicating it likely exploits PDF vulnerabilities to redirect users. The presence of numerous external URIs, many hosted on compromised WordPress sites, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards exploitation for client execution, potentially involving embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://cructi.ru/uplcv?utm_term=number+of+exemptions+claimed PDF link annotation
    • http://decom.pro/admin/ckfinder/userfiles/files/nekobexitikazereribu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a139292c644f09b5dd56eacc81494882/papobifibinanolukozeze.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/16975779648.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/jemigew.pdfIn PDF document text
    • http://cpils.com/userfiles/file/gaterapilofaxusif.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/fufenizora.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/jtphr7f3lip9aoimqambr6elb3/3245340543.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/2qlncrms7h95cs48304f1ruvi7/newuzilawo.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e31869a5d1b---63099294620.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/towekax.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/90285bf68d49e8fca141461052cbad64/64035814408.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/29926290734.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/4n9lqaf1du2brqf088jlatnr78/takexajidozugabune.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9bb169596---65381575231.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/s121rb4rkenmjnt3dqvmnv6kj7/gunexagegekilitodizosat.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/nubanafusipirinaxofelel.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/77315572222.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089147d919cc---34787462952.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/1a88a49fd984ecf10bdd52e802244517/62739237923.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e2b3612e799---piligejodenubodinifazo.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/towakoxijatuwibosazon.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/58982800619.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/nigopujawo.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/33941848993.pdfIn PDF document text
    • 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_off0000ded3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED3 11100 bytes
SHA-256: 700cbe772a5338c47d46a8bd212cd1dc71df1ee314cf0cd88d423cd4879ec9d8
font_01_sfnt_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 16676 bytes
SHA-256: 0977707fe77c72990a6a961ab9e39285331bc0f048f77c583a3386737b8dcfe1
font_02_sfnt_off000123cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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