Malicious PDF — malware analysis report

Static analysis result for SHA-256 d94b55bd7cc06691…

MALICIOUS

PDF

69.3 KB Created: 2021-10-03 14:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f8e00aa8c48d223722c221a34a50d709 SHA-1: 8858fdeb89923d03cf276d057139e0a1c894e482 SHA-256: d94b55bd7cc06691aa93a5e54d234ffe21f08751341807a0318f2e1f1ccd83d6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=visible+light+is+an+example+of PDF link annotation
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613def9b10a7c---vonaluxi.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/99177194346.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/sosotopamazevule.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/bapeziwatorulabiju.pdfIn PDF document text
    • http://fastbeatbattlerider.saint-fun.com/assets/upload/files/61205543894.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae54a984a7---tifegope.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/guvazeworoj.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210923111136.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acdec2b988---sabovotafujufevaseg.pdfIn PDF document text
    • http://hasyo.net/files/file/jonumipelumejorexefif.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/gisurag.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/74761689747.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/17594375284.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/rigirutovep.pdfIn PDF document text
    • https://oferta.lt/i/File/dogijumojoriz.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/zatidokusulujiveb.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/78f1259fc2cd6b8a4fe8336ccf7cc0b9/zafenagowojejalexunufebo.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/duvuwezaxizep.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffbbfb6fec---28364018638.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/wowukudamuputujawivufemo.pdfIn PDF document text
    • http://hypovyhody.sk/res/file/67593238454.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109220708125436.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_off0000af15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC727 15732 bytes
SHA-256: 3563a801183e7a966d0c68403250b38f429c248efad05263a1f630cf0b335c0c
font_02_sfnt_off0000eefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 10916 bytes
SHA-256: c7ff7612e3ee561ec4bdba112811dc60755d9eda57ba9ef8afedc8590c9d9704