Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c35bcf645dc4df…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 23:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 17a09a58999247a052016cb6cee42ebd SHA-1: 5fc3c28fc72f2be84a31885696ee4aa88f4ae374 SHA-256: d7c35bcf645dc4df309890a9d9b9ad1c73fa33cfb3510ebae977aa459cdce00b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://trumoi-khutrung.com/upload/files/82958170845.pdf In PDF document text
    • http://perevodvnegiloifond.ru/pict/file/bisawomagudidu.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/kobodob.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2c7c6140---81677654489.pdfIn PDF document text
    • https://italvaping.com/file/16246511783.pdfIn PDF document text
    • http://greenld.com/userfiles/82423773074.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/vasoruxibarukekirivubuwoj.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/kadidunotidurutovuputa.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/56469981168.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210911_02653F17D97A7895.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/85120362881.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/48832706385.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/pifozinedotalimugosop.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/80302092778.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/wipetekeler.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d3484cbc7---51999366080.pdfIn PDF document text
    • http://hoachattn.com/image/files/60806901293.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/96635798458.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/simoburewexutejuvumixuzud.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/52cee78223f8de6b2033381f40e2ddfd/nunatunurogetonuge.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/dosozelobaxerovabogij.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/badexeboru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=2+corinthians+bible+study+and+commentary+pdfPDF 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_off0000b727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3E 11260 bytes
SHA-256: 9417ecda2d138432f73c90a74927c2e79894a1e0fa6ac888a3c74d3b420a6eef
font_02_sfnt_off0000e948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE948 16120 bytes
SHA-256: 42728865994f1aaeece8b4801ac5ac8b5cc2827766791e91215ff83d4e709a64