Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc974e69f334a091…

MALICIOUS

PDF

87.4 KB Created: 2021-07-06 20:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 212344d97ca090c3055571b8f17fe83c SHA-1: 58a2779231bd35e432d3c24dd6ae286282a7401e SHA-256: dc974e69f334a091ba8ddb1d85267f43f694a572038ea604d86f8861a654d718
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of multiple distinct hosts and a high number of links per host indicates a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e2495d27c---tosopegudobudabogemevi.pdf In PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608103cf17164---noxapovowelumubobural.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095773a41b62---malevasikodonelonapot.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/gerida.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/dd92b66f32966920d502af5d9c33cfa0/3607172946.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e76e8f2cf0---83336671165.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/kizowix.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16083ba5330e3d---niduzudaxogogegarabom.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16071b45959e59---giriteretujixelowaluje.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/5669447322.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/81352268736.pdfIn PDF document text
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/58748609057.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/52678220480.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/8088513503.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/8969e89461103f5d7426e7a208d20983/21191987678.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/2cl6s7huc1av4hfnfnsf6k1dh4/4092043327.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/11042897025.pdfIn PDF document text
    • https://coil.hk/upload/files/sibarolesek.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/60105271082.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///vadorixiginexoxawopew.pdfIn PDF document text
    • http://ausafe.net/images/art/files/togugimigopanedunituw.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/fewikefanowatizokezisuv.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/84724147771.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/itrphicnc1984273201h9adgb3/sijinupituvigatisewepa.pdfIn PDF document text
    • http://asfalon.com/__files/file/86716140455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=good+proverbs+for+studentsPDF 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_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 16792 bytes
SHA-256: 8411c970d1bb407f6e7eb84cbf4b11bbecfa65e13616e7b0e7ccb2c158e68738
font_01_sfnt_off00012063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001387a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387A 10536 bytes
SHA-256: 250552015c057603411d69561ac11f983569beb723aa300183cafbd763c869b7