Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57f968d74445fdc…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 05:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d6ceec4e9639c8a602c48e6a1491741b SHA-1: 17335f72dd64a81786189fe172c5daec444f6981 SHA-256: a57f968d74445fdc1adc353b7b7216230ea66159aa8f806aab55466a556a0f09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to domains identified as disposable hosting or potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the link farm heuristic and the high-confidence detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://jjw-led.com/userfiles/file/patobowi.pdf In PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/getopejukitaketozopok.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/6bf82492d10fc5abfd3b9ce8327fcbda/67513293147.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/narewuj.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/vodujovujetotonadujozis.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/kezuworifimuva.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/xerapudigenilozaju.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-10-09-56-36-51.pdfIn PDF document text
    • http://bakoca.hu/files/file/xamotilojixon.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/jisumakupifukufano.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/44311625288.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16138ee6bec173---83569619047.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/61507809284.pdfIn PDF document text
    • https://almavilag.hu/files/files/losepabowixu.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/70231987978.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428eaf0b6f4---14599039365.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/palubulujogajin.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/napukemesu.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210916174401.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/nepifojazin.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/1aqnntklh25s90ccadtjk70e46/pazogeg.pdfIn PDF document text
    • http://chinalabware.ru/d/files/87485316908.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/jafikivepabonuribageta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ad+free+mx+player+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_off0000d695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 10368 bytes
SHA-256: ad2e3e6229886eaa3866b5743fc4bc037ce4531c77dae0ef5e1f8d5042eca429
font_01_sfnt_off0000ee0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 18784 bytes
SHA-256: 508bf797728799cf1d47ca2266b02e2bbe6e96db213457dbbb9296b6901e41d1
font_02_sfnt_off00011f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1