Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee6186dd868545c…

MALICIOUS

PDF

71.2 KB Created: 2021-09-28 00:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0037d90a1f8f85f45e95ee86c6b0337c SHA-1: 0449e4696f3ea258348a81ca48daa09e6907579b SHA-256: dee6186dd868545cad471e7816dc50bce7d5a919a78ac24cf83e0ecd03d439ef
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs, such as the one pointing to 'eduomania.com', are likely intended to host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.motionmantra.com/userfiles/files/zafumekuruva.pdf In PDF document text
    • http://pvvc.cz/files/49839053814.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/vikelato.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614c49b4767c3---75559215179.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/fupabovan.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b045d50cd7---82357631891.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/ninetisufurejeviziguvi.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/6500481597.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ae9a527d30625ed6ad120a8e54edbef2/gefufulewejubonoti.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/22713022956.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/11817045378.pdfIn PDF document text
    • https://sanagustin.cl/files/fezibesewaziboz.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/83371106532.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/45463443086.pdfIn PDF document text
    • http://pk.mo/userfiles/file/zulugogake.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/90758646436.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/worovifuguzu.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/bujeri.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-9/20210909040142731163.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/zumolitugon.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/xogezekekagepudazo.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/migab.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/56836341118.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/bukedaresufedunab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+people+hack+into+accountsPDF 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_off0000b3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E0 16460 bytes
SHA-256: af2894924167514361b2300eb25eeb71f5ed2e729e226b3ec882d74d24b441cd
font_01_sfnt_off0000dde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FE 10780 bytes
SHA-256: a34c9f1679e905d385318c9c913a9a5cd7c18502a38822db9a49b75a2bac337c