Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c8d9d0689d6c55…

MALICIOUS

PDF

85.8 KB Created: 2021-08-20 19:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a351636c0afeb0d02b3f095267e0011d SHA-1: e34c3a0434416cfd7f1b5ce1e5a9d84be4d8b687 SHA-256: d0c8d9d0689d6c55dd109da54da8fe67ee6485bc3d31e64498eef07346f37623
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and link farms suggests an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wwstationery.com/files/file/47666254682.pdf In PDF document text
    • http://vce34.ru/attachments/file/vexupifojovi.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/89401267009.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/34943561654.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160efdcc68b43f---4595651417.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cee5beb0216---donidumejatulo.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/8nofme2tdkgdn5fsmnjh3gla74/72688120299.pdfIn PDF document text
    • http://drtamerturan.com/file/bujugasigufolufu.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b87739440---rowosulekuke.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210605140237.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/zofaretaxunuwiridid.pdfIn PDF document text
    • http://keigan-productions.com/clients/863431/File/dudemokubipamufolixizo.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/fatunuragukodezixe.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/gafanizegixidotuseb.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/69796176362.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/bulumeluxototu.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/65cd7b83b0aa6bbe477f83f606066728/34463928593.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/zozolososa.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/urra5t98jvopjbs3s2pu6qm2ge/98888903873.pdfIn PDF document text
    • http://allasclub.com/campannas/file/povulivos.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mosemufiniwumovu.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/lajanopix.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1ba7e1b7fbb832a3698e2eb28a3f4270/kewufefazapakowixer.pdfIn PDF document text
    • http://kisito.com/userfiles/file/65338221548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=graphic+rating+scale+benefitsPDF 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_off0000e9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D1 10816 bytes
SHA-256: 79ba8afb058fa531a6bb7cf4a93b9e94fb66249ce6c636f8327be6edfe50f0ff
font_01_sfnt_off00010280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 17180 bytes
SHA-256: 7d72558ea9ce2deeb20ff545721d7bf8a4fc007d4f76d0f7dc8e1ff85d2f2121
font_02_sfnt_off00012f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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