Malicious PDF — malware analysis report

Static analysis result for SHA-256 2358a4f9ec127e31…

MALICIOUS

PDF

90.7 KB Created: 2021-09-06 11:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 4270c29f090b5d0f134a615bcc022d6e SHA-1: 02e6b19a217c328179629188390707f244e7542b SHA-256: 2358a4f9ec127e31d1e2f3789cab9e4b7733f2f98c7f5096180b6a22fb4a1b9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/fe37k1ec3ba1lttbn4hctuj2cd/30805033304.pdf In PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/tla6okho3hqcp92t3m5dbstg12/sugikosipatejirat.pdfIn PDF document text
    • http://slpclassof67.com/clients/45391/File/49036224443.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/lupewuxewipakovali.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/52145071620.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/75871728767.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/28285714689.pdfIn PDF document text
    • http://kaies.net/upfiles/210710150257059671pu5a9s.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/44121826352.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/nisupokikijeb.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23ced350ee---dadejisefebabuxukilaf.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/62263402126.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/37509907877.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/maxemonedupoleselipos.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/58934992946.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/xukezunisidisowir.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ial5fcnh9e034jac7brlaqij81/97535170816.pdfIn PDF document text
    • http://princeverma.in/uploads/files/mudejezipila.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/63371388148.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1611543df210b3---kavejiwopo.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6283027506---ravepafejisewu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/abe490763ef262f1d7b4eb6d6b5d94b2/ditobomololepozafofu.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/5490625ab56a86efea6904820bcc8fee/58019061396.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4bbbd578d---kibuxijemosawid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=absceso+periodontal+tratamiento+pdfPDF 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_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 10904 bytes
SHA-256: 355f9a38c4dc7df654272327bf6ac72097454ecee44c7462f00ad5c3e684d868
font_01_sfnt_off00010de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE9 20784 bytes
SHA-256: 2f50aa441d052c1b9b7d5a6c4ede3aaf2b0c1a0115b61c6068df28109d72dd13
font_02_sfnt_off00014338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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