Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d5b70cd2796235…

MALICIOUS

PDF

92.0 KB Created: 2021-07-16 16:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fdaf5544c396efa8cc2bc996b03f91ff SHA-1: 430178653cb8eddddf4cf19c53d47b60cd3b616b SHA-256: f2d5b70cd2796235c955ae8c478a1932230b0f9b426e8b76b7de1ebf90586323
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, some of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish for credentials. The document's structure and URL distribution suggest it's designed to evade simple detection by spreading links across many disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.tunnel.de/files/uploaded/file/kovigugixoje.pdf In PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16085a1b195652---358177345.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/1ul69hpiluipki89nobfp1c8f2/39962756465.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/57769800491.pdfIn PDF document text
    • http://servmed.net/userfiles/file/vopajotigusokefavagaj.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ucm6ko76cksr5tr7auldmdash4/widivagowixov.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/pororexapapifabusafefagos.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/u6vrcgh7qdmcmnqtff7ajdo4e4/naponito.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/gusoxadamugidi.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/fbf33ed11ebc0cb41169cbf12e83a54b/dakitisalewaj.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/15509500859.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/pigewi.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/976c800abc1b31ffbf185d4f13121196/vizuvixeginafu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c5966cbb9a5---93337906662.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f91ea44c5---fenusir.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/97909836721.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/diwadalulegiza.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160961d2135050---50725545323.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af6e625177e---6100427678.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8ff215a1---jamananudofibidazu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/l2al7e5rtlb44rsi8f5rlvhgi5/sevaz.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/muxujer.pdfIn PDF document text
    • http://dzbnf.com/upload/file///sigekal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=group+theory+in+a+nutshell+for+physicists+solutions+manualPDF 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_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 18504 bytes
SHA-256: b9f9b7ce98e84b9990b4455d6d4c0be66b44f195a243591d16648a18eecfd668
font_01_sfnt_off00012e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001468c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1468C 10996 bytes
SHA-256: 488b401e66b2e96ee8d5f6c17a4065962606d160009d3cd7576f061619df7cf8