Malicious PDF — malware analysis report

Static analysis result for SHA-256 63469f5fe69a1cc9…

MALICIOUS

PDF

90.6 KB Created: 2021-07-02 06:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9f260b1c97ef3af044a8f16e84556be2 SHA-1: 31c7f69c3a32b4d5d8ca44819142f0c9ab95374b SHA-256: 63469f5fe69a1cc9c59437db2583606ce729a0651979a6ce01b76881445f43cd
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely serving as a distribution point for phishing or malware. The presence of multiple links on disposable hosting and compromised CMS uploads suggests an attempt to obscure the true origin and purpose of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://pospatrans.cz/UserFiles/File/webixe.pdf In PDF document text
    • http://softtox.com/new/userfiles/file/saruwanapazaputufa.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5188f61b---fovanulo.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/rc76vcj58m1mk2ncbuo662rbb3/rokajapasopokanebogok.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/5fc90b3f933b41b8c04baff37c0a139d/86056928401.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/satifolipog.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/56802336055.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/subekuz.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/aaca7e40fa369994e60151377ca4854d/8698107552.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/kesatalur.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9682f5a359---35656259036.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859440314ec---85376066613.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607182f335fe5---golanolu.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/sabupite.pdfIn PDF document text
    • https://aspirans.com/files/file/52746688537.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/64840347082.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d7b4ffff7f95732ff035439fe660fac0/rapamadajenajufu.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/98076123719.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c6465f491---79973448771.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4e965cf5---kovufivulugaxurasawipum.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/gekusinuvex.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/43514516120.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/fikokarorajofawatit.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16089c3dd823e6---lilokudid.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/99437121663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+do+you+create+a+hyperlink+in+gmailPDF 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_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 11176 bytes
SHA-256: e4b8c225957f8f9e95de0d397294217938b228970078693cb985cb5344b5da6e
font_02_sfnt_off00012f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6F 17516 bytes
SHA-256: f299c820dca980cec10ddc6227701090530556b8f40039a55f0fbc9f8441b2cf