Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e072e4e8dce1b3…

MALICIOUS

PDF

98.8 KB Created: 2021-07-14 00:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4735a2cf48283673c94930495037ee8a SHA-1: 8f403f9fb62c0f96a64e0bd10fc2045564facb7c SHA-256: 64e072e4e8dce1b367c16ed11f2150eba4bc511fce19bbbe365d995026ad5efb
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories. The ML classifier also flagged this PDF as malicious. The primary purpose appears to be directing users to potentially malicious or SEO-manipulated content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 5

  • 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://uctodane.cz/UserFiles/File/xedalidadiganiriwa.pdf In PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/22717046353.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/55537dac0d11dddaf4a65532b908c20a/xavuwatix.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1a48b79a6---rofuduk.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd228db5f8---60986418996.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdf714fc34---lexemekosewimuw.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/26857943154.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef514c4fa3---vijekodexoxa.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1068cec239---12169791602.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4eb488392f525a92ad6b4984a28c4e69/vipuvigizifajovimogelume.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/notikeladibidixuvavib.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/5274d565c8a1c132a5d8d82070ef2f7c/xusizijabedodojose.pdfIn PDF document text
    • http://webursitet.org/Files/file/fikitawerapusisozuxeka.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/7k4214eavrt1qmbhsvi4j1lj75/berewamoke.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210708/file/16256952764345.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d157bbb6ba---54754415020.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/woteviwamovupuluvogujopud.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/dibedi.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/sivubenikig.pdfIn PDF document text
    • https://bnovum.hu/downloads/vigaso.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160903ddae86ab---lizofurufar.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/5c0069e3a471968dbb45d24294291c1f/64387712145.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/pioormmueodtrv3ord9hvnqkr1/3416135919.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/mirijovadowuvawabutopiwa.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/xupudejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=king+henry+the+8PDF 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_off00012113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12113 17576 bytes
SHA-256: ae0a4349cc2ccc03e506642fa0c65c71520255e41306f4eb72bc00c114d62f9b
font_01_sfnt_off00014f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16755 10204 bytes
SHA-256: 31ace9f6daeb1f903a16e8cb7f3eb1ec1d6efe7bd9a25ea09218982a0b8b74d8

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