Malicious PDF — malware analysis report

Static analysis result for SHA-256 b356cf908d3f2562…

MALICIOUS

PDF

90.4 KB Created: 2021-10-15 22:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 368468b55be0d0ab7826cb4e519c3cd3 SHA-1: 0ead32cfc73069cc507e23c4ece4a6c2760881d2 SHA-256: b356cf908d3f2562771bf4acb3e6f8f3426bf0c101168a945010b38abbd28609
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

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://profiklub.sanswiss.cz/files/file/tarujazebop.pdf In PDF document text
    • https://cfbadalona.net/ckdata/files/28066178515.pdfIn PDF document text
    • http://szjg.hu/images/file/12385433175.pdfIn PDF document text
    • http://rococosofa.com/files/files/79304851346.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/a2bfs4866sms6fuoaojjl1l5bq/minilibemokejuwotile.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/zebekatudaruz.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d42ff7c54d---pilajukufogovajav.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/fefupimonep.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/nixomitakexuletijofog.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/fepezu.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/patixunubawesufasolu.pdfIn PDF document text
    • http://chinahongji.com/d/files/zuvixafesadasojes.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb1d9def59---lojebukavomut.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133baacafe45---xededosukigegon.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/roxarapa.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/raderivufuduninujuxi.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/99097589702.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/49920592030.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/5612808138.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/dakamikafafomajukazutafav.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/92629203721.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/buvatufikojufe.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20211002142122.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/67035093855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/D9plVHj2VOU/uplcv?utm_term=food+safety+and+sanitation+practices+in+restaurant+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_off0000fc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11452 17880 bytes
SHA-256: 50f63f546a64be42ed7dea9d50f4a51193ef042d6dc0ece3961fa5991257f7cf
font_02_sfnt_off00014210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14210 10756 bytes
SHA-256: 4dbbefbd432e3998c96971d4807dbe56650c24f8143fdb61e9c55575a1400571

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