Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf7fb4128b4a8f4…

MALICIOUS

PDF

84.6 KB Created: 2021-09-24 07:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: df3ac6024e29bc729daad23591426fe7 SHA-1: a993050b1bff6fed2f34465b0082f5e56a3f89d4 SHA-256: caf7fb4128b4a8f4228bc58bec138eeebdc546d2f61c3351ef742fe82e8777bb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pixomot.ru/uplcv?utm_term=simply+piano+on+android PDF link annotation
    • https://wmu24.ru/media/file/fodisoz.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302f80646eb---kawolefiwiriwut.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/49157503909.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/90327601601.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/zimajapakiwipedona.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/wigusonusovizexawevebut.pdfIn PDF document text
    • http://planbmedia.hu/files/56263520927.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/68921465051.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/eb01aa54b8d973ce2495f463d33ea4e5/32539191652.pdfIn PDF document text
    • http://dobermanncz.eu/files/piwoxoge.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/59125555701.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/jirimezogoju.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161319a420948f---segop.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/25914347934.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/56108011737.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/jikamopugobudi.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/lelutagefimodulefik.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/19943264389.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/63514619381.pdfIn PDF document text
    • http://zenithmetals.com/files/zutogerejozibapax.pdfIn PDF document text
    • http://wdnederland.nl/file/44667302494.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/ramudesodugor.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_off0000e906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 10344 bytes
SHA-256: 98df65d3ef9509003bcb1d6c1329327cc1759689c37ae1cb941e92e47919bd1a
font_01_sfnt_off0001003e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003E 17296 bytes
SHA-256: 921bc92c39a025015a9d554cbcf0b9c630a81c0febb26104940830f8cb5075d8
font_02_sfnt_off00012cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1