Malicious PDF — malware analysis report

Static analysis result for SHA-256 0923c68bc5898435…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 18:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 09d5a10c598b8fb7b00c63bbdb07c385 SHA-1: 28f19d42a6397a9ed9ba3a55887dfb026e918a05 SHA-256: 0923c68bc58984354df9b77007ef4b2d6bb29471ea440f265f9068528276d4c5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chemtron-vostok.ru/media/file/91940304749.pdf In PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/61dbc4f734ea6ccb8da1bcdb6414692e/9713174439.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abc1a20adc---ligaj.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/pufopilukovez.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/remomugoduta.pdfIn PDF document text
    • https://seikai.jp/free_images/files/26994791334.pdfIn PDF document text
    • http://huarong-bio.com/upload/files/48433996995.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/72994275582.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/koralufamozonawulujeluza.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613baf573d64c---7291405538.pdfIn PDF document text
    • https://dalba.net/other_files/File/21679466639.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/68146063102.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/49219745010.pdfIn PDF document text
    • http://weldingplaza.com/files/file/jukexogekolusen.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24946198425.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd5365822---xebuletadagerudes.pdfIn PDF document text
    • http://ertekeles.diakszempont.hu/userfiles/file/werapazizinotax.pdfIn PDF document text
    • https://eternalbliss.net/file/17564078402.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/61724767832.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cdaf430e20---livokizebotixufuriz.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/83730430104.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/gomozupipebepozugabosi.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/7974580958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=skribbl+io+2+playerPDF 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_off0000b2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CE 10416 bytes
SHA-256: f5867f846697199ad86a988484a7911e325def6efa272e1aaf45ebf292f8440d
font_01_sfnt_off0000ca56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA56 17680 bytes
SHA-256: 37bd4e238d77a9f681b27f2a1bf2e3432a6bf41f8ffcab66f6f698e54c4cd46b
font_02_sfnt_off0000f730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1