Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7719f1f7a7aa90…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 05:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a1325111d40cd506c8ce811ad2eb1b0 SHA-1: 65ac74e7879cbe857a6ed7da18236b31a7acc541 SHA-256: da7719f1f7a7aa903eab66f88ab307499b1ef6be9f1267106cc339503fda8ef6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to external resources, some of which are hosted on compromised or disposable domains. This pattern is commonly used to distribute phishing content or redirect users to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mn-lawfirm.com/box/userfiles/file/77765631376.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16088bdfa7aef8---zagexoxiva.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210617_54F4CD005735269F.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/70193085242.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/gopuliwowomanamule.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210825_041934.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5bbd0e8fb---79445020318.pdfIn PDF document text
    • https://megashina24.ru/files/files/1950183119.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/runitomunetuvikuvulejiv.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acfc295e233---donitim.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613255e42e079---nifizazusagitaxojorowoles.pdfIn PDF document text
    • http://congluc.com/upload/files/89649374519.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/lfkrq2eijkon47t3g7etp03dkb/54274598322.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/85475587199.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/23209398985.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f01170ad---7096190294.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/b346ebb454dbe5f41a31835a4ca9c7c8/65615092329.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/084d86b9026ce163b3880dc983f9a18e/84350566120.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0df0ff1127f37ff265aab2a4bd1b4b7c/44308202043.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/79483861396.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974259e9067---tofamilitux.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/6221082916.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/zajujemurodoxilapotar.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/57721560699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=means+of+communication+matching+worksheetPDF 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_off0000dea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA7 16684 bytes
SHA-256: 0ba8aafde0c4a0e83fa9ade579a2dea606770ea889ed8024646f3ea6e3f8bd6e
font_01_sfnt_off00010972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10972 11008 bytes
SHA-256: 99fbe51a1480dc05f8e280f52adf9588b9ccbb93689dcd3120f721e43f120e67
font_02_sfnt_off000122f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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