Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f04b38a608d7f25…

MALICIOUS

PDF

94.6 KB Created: 2021-07-03 02:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d606c2afe0dc52800e34044071c82d42 SHA-1: ee4c2e1c71d0283e6c599ac8d9e5de4a68e81865 SHA-256: 6f04b38a608d7f256fb5bd816f85d0068628f9e585b1af1a45871c50abcdc20d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites acting as hosting for other PDF files. This behavior is characteristic of a link farm used to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00b5062b4e---vujudoketiloxuwogolosule.pdf In PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/ed6db6367d5ad0a11dff4df04f7e4dea/84217364567.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871b3eb4169---serokogixokebuwivogire.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/98401c9a153599bca2a1777b2a6e7d65/66876880044.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885307e8359---39534061541.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/friuuavtbcjqtpgcn4jpunilon/talugudo.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/2c20bb0316b3f83e25fd17f6009eb4ae/97016433417.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/zubamugigesawipozanis.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6f87e796d9aba97a998d466f4b873d47/jawuvagoteg.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/91756173916.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/su8i2l6ha45unj7qtm3jssmm08/sitivejirupi.pdfIn PDF document text
    • http://ozari-ua.com/files/file/sodozilufanedexurife.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/jfvs4mb2s3kf5foef0mstk98pb/kijavutowimebawur.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/aknhioar8hjgl1diikjq5vhgal/mimefaw.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/22218748360.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/0udkpjda5seqjcbi44pkcsjis1/17068556327.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/qegmbqggk8kndb3d6m2ajod61q/roxipifumure.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070064704115---gewadipefuganopup.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/8o0scnipmmma995phk8fu4ueap/zakimusesowuwuburuze.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/dukisuwanovi.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b263394b37---tisijujomanujipagezodafap.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160db98d6cab81---68958912242.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f20c44fcba---tudatezogivosetekiduni.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebca22c914---zotewamov.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d3f7f3904---81793160635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=disadvantage+of+using+hydroelectric+powerPDF 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_off000106f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F2 19936 bytes
SHA-256: 48c943948b90e96b7293b65a64c5315c10b0f6177a5d7e93ba252177439dc9ac
font_01_sfnt_off00013a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6F 11268 bytes
SHA-256: e82f16085835653281d99b8819fb23e93c66d931788d0706ded4b547c47a35f7
font_02_sfnt_off000154b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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