Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4efbb4d8a9300e9…

MALICIOUS

PDF

74.5 KB Created: 2021-09-17 08:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 356226ec7eab9cfdea49a5e72e6c2769 SHA-1: b8bb01ed25b990c03885ca29c4b56c942988a501 SHA-256: d4efbb4d8a9300e9771ad61ffc07f25edf9be8f341cb50fc94b70d537993add3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL analysis point towards a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://apex-architect.ru/images/file/74847923497.pdf In PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/7f663412c3e2b5f8f7df9a6822fecc68/65388681856.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/rasilizuluzegirovajadab.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/gizesifemuzewagoposovige.pdfIn PDF document text
    • http://honghuibio.com/d/files/kuwapanemewufibab.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/58723426998.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/jupagufe.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/836768668de0786e187beea4b2209cd4/32110811655.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/pezori.pdfIn PDF document text
    • http://belovosushi.ru/files/64125928799.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/95907949600.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/wagoronosexuwepotukuwumo.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/vusanafozozivomidudo.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/48575344540.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/17622480886.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/4tk98789rlcs07vno2poba50mu/xageduxamavud.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/77836609292.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/naguxaxugawow.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/satofujopanarugiwuzu.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/17784776676.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/3f794b0eb7baa88cb36b14179f82a507/sazoruda.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/debozubob.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/dofox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=truck+simulator+eastern+roads+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF90 16840 bytes
SHA-256: f6f2bdf3a91726eed923e68d371b85dc0d56f42c568b32ff6414e82423289cd1
font_01_sfnt_off0000eb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 10832 bytes
SHA-256: b618f3638404fdb83b9565f507c10f1d5cdb3f899f118533ab183d4766a51ac5

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