Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc267313e353fa1…

MALICIOUS

PDF

93.1 KB Created: 2021-09-07 03:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 897ce61f8c84edc155209f83ae78db18 SHA-1: 9eec98cb4b54e61acc0622e0d03b05fa85239e5d SHA-256: 5fc267313e353fa1d6e3389327b76ed99540abb09bc7a5491d38007eea679641
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF-specific heuristics related to URI and link farms supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://oniceh.ru/uplcv?utm_term=pasos+para+armar+cubo+rubik+3x3+pdf PDF link annotation
    • http://adveotec.com/img/file/80213125112.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-27/20210627194436813374.pdfIn PDF document text
    • https://temahr.hr/files/43135873444.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/73450996494.pdfIn PDF document text
    • https://ottopianos.nl/files/zawobogubegisup.pdfIn PDF document text
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/xowuligaj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d287dcc1e8d---34574435720.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/95502146356.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/n4o4q406mu8lubrdrlcbrt4qs3/39321422400.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/76114903031.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af77c8bb0a5---18134369504.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092da80725c5---mewifixifiton.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/0ccv04qsai5jnnk2eejhoojo57/dafet.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/45018726831.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/kamufo.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6b00a1b8b---kepikesom.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/72904456821.pdfIn PDF document text
    • http://moristas.com/userfiles/files/mufarikomi.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/abcj2f4dqe2rlhmfn17p2q05m7/wabewixikawebetogosa.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202108120512439521.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb606298ab8cb1ec545f02a89145b99a/54094939044.pdfIn PDF document text
    • https://carlojans.com/cms/file/9806814489.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/lubunolegupovebalu.pdfIn PDF document text
    • 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_off000103b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B5 19396 bytes
SHA-256: 6e728afcde40b9f49b0d0c3b07afe2e110ee7d23ed35400ce11c6f7bb20fc402
font_01_sfnt_off00013515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13515 11008 bytes
SHA-256: b090ddb2d7852317bc1a80c4ed14cdfdc03bdb6425b8c3b9225d358f9e9b8f28
font_02_sfnt_off00014e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1