Malicious PDF — malware analysis report

Static analysis result for SHA-256 32c4d4c77671577b…

MALICIOUS

PDF

83.1 KB Created: 2021-07-16 15:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dcd7f885d48c905d56412ef982a3ef07 SHA-1: b2f827fdcd57c1d55a4ec736b8c96f25cdfa0e83 SHA-256: 32c4d4c77671577b789ba43d34044a31f87fdf3a378a6e1c965bc4e56a264209
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://zaintik.org/files/galeria/files/bururuvalidutod.pdf In PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72eef8a674---fuparuresesavevexuvi.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/05add6b46844f701b7c4638eef5b495b/54945367337.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/pokopobasotado.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/96521719175.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/mirij.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/bozigozagek.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4cff2620f---10868784973.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/komavevikovuzajejutej.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/lebiwufixukika.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d280165e533---mafebanoresufejiw.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160912757f1f69---65069367460.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/vosederidonipadus.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/tewulalokexefemen.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/71563121189.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/novogupikolejunebu.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/warexi.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/79013107e90ba75701a2bb0f7afed5ca/xuvuzusezuromozumizifudak.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607f33f4da0ce---tisifikumogel.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b589df95b79---8743389116.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/2g1m7r9fbsrnllnkj6aaks2osd/94636068546.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9b1mtm32rvcfvs0usodt5ke494/kiwuzonanotevukebewabe.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/i9i56fuuejq1og8duhfav19veb/xaremexomip.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160757d0d44fa0---73537322688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=nice+meals+to+cookPDF 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://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_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 17144 bytes
SHA-256: 2f198e12fe0eeb706086c8700448f98bc1364613bead903a23b06e40f24e6dac
font_01_sfnt_off000114fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 10256 bytes
SHA-256: c4c059ae123dcd0f1f32388e78a81b83ee789a2d664aab72f69051515be121ca
font_02_sfnt_off00012c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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