Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4743220fc5cea1…

MALICIOUS

PDF

89.6 KB Created: 2021-09-06 03:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 970f4ea5c10881cd0c3105d4d0e95eba SHA-1: d71e27e5f2b7f7c507604ba4ad2816487269e507 SHA-256: 8c4743220fc5cea111f5d63bfc8b6ffcc1b2bf2eaba42e45ed60bb0f76ffc9b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://tfh-filter.hu/_user/file/40757727231.pdf In PDF document text
    • http://mea-travel.pl/userfiles/file/3053403517.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bae58e8952a---53258895504.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/girosenamedudutemokap.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/i0iqa7odukj7drhbvdphkho4p5/52079290123.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///86541339882.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/29045910533.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/kevomowisope.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///novibugorosepowevum.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/nimenedewekojesafiwo.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/254b0f2a90cf3029ade1919fb92b9036/detavabemadubasesuzasuzuf.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c96352bdd11---46126470293.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/26614021735.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16078820b43ec1---65227440574.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/9np13fjtq02gm7asnalu2ggn07/24514337575.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/486ad09ddcb10a028b7fe6f0537f918c/gukos.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fe57fc5f586---mevujusopanamukezufave.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/75774342676.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b74dbf67611---22834641396.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a985a77bf06---bigoxatom.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/27082887920.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078583ff14f7---nolibatubisuxog.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/19203268709.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdbc0d50bda---56412729651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=personality+development+test+for+students+pdfPDF 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_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 10940 bytes
SHA-256: 6e2f59a8fad2cd91b0fa84710138102054b35d0d2970d8930b052de4e239a513
font_01_sfnt_off00010e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9F 19228 bytes
SHA-256: a99a4eb41f4658c094371d9ec06403b0d035c0e6092c63c06f6ee0269237852e
font_02_sfnt_off00014020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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