Malicious PDF — malware analysis report

Static analysis result for SHA-256 754b44002e1d8aff…

MALICIOUS

PDF

83.2 KB Created: 2021-09-02 06:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3bf82ef4c4f191cb55fbd47ebdc47c01 SHA-1: 0c0c0c9fec6c7380fa04b51ccb349520a075ddd8 SHA-256: 754b44002e1d8aff37b78d1391a9c8264f453565a392ea02bc65763478a27613
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting, likely to distribute further malware or conduct phishing. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it exploits vulnerabilities or tricks users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c099449d717---17846543894.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611e491559612---36158102408.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7caa0dbe4050aaafebccd8fb2097dc64/53224403530.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a666fec88a---2402962142.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/b336946388372034ed2ba8e2d9393cf0/98959280240.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sg3ugu4oif8erdv8kpns7lail6/jowebefedikelazotos.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/devusutibibof.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcbda5cfd1---10745064295.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/80913815402.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0ea53d88327c69db92fbe68efd8ea649/budeputurapivo.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608495f44ab02---68615563227.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/74711770364.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/4dfbcbbd313e34aaaf955e3480ce14c7/41530780307.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/gasojipedibepitulopuf.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/9986528693.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/mipurigijego.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/budizi.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/abb73ae8f096d77cef606a04edf2b0b1/sikibijoleropikoxu.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56428972182.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/falajogudunalupukun.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/nosaxufazakamixa.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/pefezoxok.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/48055839988.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/60106866600.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/54611970195.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/sefiraditeroma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=office+convert+pdf+to+powerpoint+for+ppt+freePDF 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_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 10412 bytes
SHA-256: e775143ea9497c6bb0fe3432de17cda376b769009a022e0a84d7dc6a8f1328ba
font_02_sfnt_off0001108c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108C 17604 bytes
SHA-256: 1648ab7daad71b7479e64062abc70705a40524359b9f0ac6df91b5244519a902

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