Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6cea73d74ea916…

MALICIOUS

PDF

87.3 KB Created: 2021-07-17 18:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 62c44ed460e5292dd4175b26c55c5105 SHA-1: 714a7fa6a3c61ab7c51b5822973f9b6703accee9 SHA-256: 0c6cea73d74ea916bf41f14c60903b75f61eba5a6e2a46fba311a369a943b3b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

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://klefmarken.se/upload/file/xebapadexubagiwexujax.pdf In PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821d984f89f---pavagavuwuzexudoporuxozom.pdfIn PDF document text
    • https://austarpharma.com/upload/files/kazuratibarumadilupug.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/dorodujokuwut.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210629132759903.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/22efb0586f34927cba1699e8ad7cbfad/44770537679.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160794cc1c5e02---16629457398.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af400e3afc0---40661635416.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/7071f277f95826ad920e19771f7f7f55/31336706923.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210624_225632.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/04a3b70e5d1d794706e6b26dfa10450f/zutuginidunabanuxevisekur.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/89789469198.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/ninonivaganazi.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/42470724075.pdfIn PDF document text
    • http://hncastlecable.com/d/files/89225745219.pdfIn PDF document text
    • http://mhs69indians.com/clients/864804/File/giluwulijevav.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ulq2hlqntkd58tj9n5uq3h6j7e/tataf.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/f55f049f9443bf1fa9713f3ae09e4c1f/90067664553.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/410fea9ccf730031fb87e719c573fb2f/foluvonemeviruxixoveru.pdfIn PDF document text
    • http://honda-vo.com/upload/file/vuzudonub.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acbc4854f09---57825366399.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/dunifememud.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/okcjdt5c9knrbmomaockcft394/mixajutukosiwesewab.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/72ae83239509bfdb0eb8c6d226505269/61047553368.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/82031475301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=about+beverly+clearyPDF 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_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 17032 bytes
SHA-256: 52d185e1fd9de9283385f398a22c947c632c6882173ce06df4c104ef4e03da12
font_01_sfnt_off000120b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C9 10260 bytes
SHA-256: d2ed47208bb4b66722e2c9e690ffff79d785d7a4c54dbf2ade3196c5c1a821ce