Malicious PDF — malware analysis report

Static analysis result for SHA-256 9082a64771759f90…

MALICIOUS

PDF

82.4 KB Created: 2021-08-29 16:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 975751331f755be535f2f93fa8dac4d8 SHA-1: 237f2e1ec6ef8522b52debbaf1645685c598d0f0 SHA-256: 9082a64771759f9006acae9b8708ca7617e9cab7842f24f6dfd9133b9787f94e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=classical+free+electron+theory+of+metals+pdf PDF link annotation
    • https://dbmotorbrokers.com/userfiles/file/41190292206.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/gononifomi.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/felivifejujogiponuganes.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/vafuwapamituli.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7fefb49d3b9240f8024e1b71db3381f1/24668572438.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/mazunuvijifubexewesozi.pdfIn PDF document text
    • http://mybed.tw/uploads//files/202108090649202343.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607472fbc3d2f---20632266708.pdfIn PDF document text
    • http://orlickachata.cz/files/files/23124619675.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/34511095587.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/70336783820.pdfIn PDF document text
    • http://beateromer.com/bilder/file/kuxegajikapo.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/23077558993.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608921a25b92c---temevi.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/3ce7k0vvmjugfa0nak8jai0fr0/22139057597.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/1632qpjepvd231qo074o79sjgs/kimopinaxotulapewopu.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611d5afdb5df1---rizogijamovuw.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/71590884696.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4b83c0a1537baf43ec70253e6c61fa15/68862142165.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f66c340ba5---fedepopesajunisid.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/xidoladik.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/dipobutaridexexojotudower.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/ratoju.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/neziminit.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/l3vol1fpoj1bal2ch54d22hjdn/47462244328.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/mapekavawo.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_off0000daf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 11028 bytes
SHA-256: 6bd60f2f05754f1da3f8fb3f90d8842054aea2864cdbbf8626966cf4a4cb90f0
font_02_sfnt_off00010c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7D 18220 bytes
SHA-256: 0dd0b51f980325a683abe6e19fc9c818689db094718e6512edaa94ea3e078734

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