Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9671ad5af1dde5d…

MALICIOUS

PDF

88.9 KB Created: 2021-09-02 09:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 63914419616948e2bd775ca894887628 SHA-1: fedd72de52ed3613fbab0a4103d8559a79c94efa SHA-256: a9671ad5af1dde5db4ef462f178f8117be62adac04e4f9e5029c30dfb8f8de8b
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, likely serving as a distribution point for phishing content or further malware. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://nomylo.ru/uplcv?utm_term=how+does+a+short+work+in+stocks PDF link annotation
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2b9119afc---nukasu.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18299177411.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1dbd3bc2694fabf571602d45866ba6d5/93250467568.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/53261729826.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/23e615db35616ea04248cf32d5dcfa82/80505865700.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/foginekatekobuvo.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/66567819893.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/29247992458.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9cc57f3c4---duzewibuvipudapivonavozon.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/da7a1b1062daee027fd968844bfea4a3/fatonejupulafurudurejodu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/21bea40ebca5ad791c164ce50c4839b3/27131985505.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4b47354b8---noxirum.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/741dfef3bbbb7b9b2e9c877a2844d5fc/legisunumosinu.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfaa70e466---64265574882.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/40974500016.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/mogegibazefeputula.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611811552e7fa---jituzeganitenar.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/fuluzunenidebizosowedu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/fe4acb12bb22fcdc9322eec51151f35a/17914144180.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/fojevexubiliriva.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/f1954129fadb07443496f999f2f8eea1/66833199771.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/2uf6fs0i1e6jaa4lcfdl5c5j2v/tadinitigiru.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_off0000f5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 10592 bytes
SHA-256: 67ace73b2cb48a0a8272da7b889c44cd154b471d8f166a4efa7ea0346976a24d
font_01_sfnt_off00010de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE8 18372 bytes
SHA-256: f079b3151df2f650ef912ac125e6c6246974e9e43b272a48b1c77f7071b5218c
font_02_sfnt_off00013e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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