Malicious PDF — malware analysis report

Static analysis result for SHA-256 d154f381833e7718…

MALICIOUS

PDF

86.9 KB Created: 2021-09-21 05:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 419c1b659e530a5fc14e52ad5f5d7c61 SHA-1: 321695119dff98f91b31069fe5aaf4b5c9224dcf SHA-256: d154f381833e77181ef02b5004e68bf3601f8f1592fdc7ddbbbdb321191e12db
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 compromised or disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and link farm indicators supports the conclusion that this PDF is designed to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dieterheich.de/images/uploads/file/62748369160.pdf In PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1eee1e925---fafivijotojilowiduzatese.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/vekexuluwedo.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/63119448476.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/66107337592.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/nerixowenatofatubuviwi.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/9857284067.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/rurigivapemuvomagisamiru.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/4935096444.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/miberoravo.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210915195552.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/5938543881.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/19688743113.pdfIn PDF document text
    • https://tcremich.lu/files/files/duxixugaludavisidowa.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161414ac8c4a9a---69911614392.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/nilowowunegagemujigupis.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/92896719781.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/3299902486.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/88130709805.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/vexaw.pdfIn PDF document text
    • http://coachhouse.info/assets/file/11882414768.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/nukexarimi.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/bumixijududof.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161326af413619---segaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=fused+location+appPDF 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_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 18376 bytes
SHA-256: 7e70cdc52664556355182464cee4eb1e0747c84c70e6cc49c3388cc3fdb81232
font_01_sfnt_off00011de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE9 10484 bytes
SHA-256: 5c5f4ca81e777531286ae7b9c480bf5e70feac8b64ff93ab8784a9efdab587d3
font_02_sfnt_off000135d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1