Malicious PDF — malware analysis report

Static analysis result for SHA-256 80034ea0d88b3896…

MALICIOUS

PDF

77.8 KB Created: 2021-09-02 17:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75f8a0ba44f32d6f9602648b6d855a60 SHA-1: a6ba7f7afcc50fb837e155c20714cc1cea9bc4e5 SHA-256: 80034ea0d88b3896ed29da1b108923e65c73ca612b8dbf78b0e8557090d199a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The embedded JavaScript is a common technique for executing malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=list+of+morphemes+in+english+pdf PDF link annotation
    • http://saptpadi.com/files/file/lebibafapifuvigivalo.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/tiwinibipaxod.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/22034432531.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/smj00ck1k9c9i8d68hjmm6c0fq/kefewimokumoxe.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/lebulufojower.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/499a40279321f7f75dbfc137070a2689/96556502767.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/gudidemozixoz.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/fowojezogigudovilew.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/dinijojawegu.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/1905566120.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/zomebuzaferukiridekak.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/d8b0d5df45055dc5bce1f2fe1bfba883/23238111357.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099f22e1c2ea---97500117950.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/d6b9f40c11b39efbcca228e1927ed8e5/68723107049.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/pikolulirimidodetanosepu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc9995501---pefulizategilosu.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/63923370845.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/12677648431.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/gininigevidagija.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/xujopupufitalituzako.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/72977172288.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/a700404405c4fe091a438d47612e4376/woximapivafebotefadade.pdfIn PDF document text
    • http://blueyee.com/upload/file/191917433005.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/xolafomutotixesenapobasu.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_off0000c822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC822 19156 bytes
SHA-256: 9295662e14c98e7074613383a8c4a708b58a63b55b2cf86c5cf1b56a25bfaee0
font_01_sfnt_off0000f931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 10740 bytes
SHA-256: 82d7268a73a8c6ec838e6f5b343015fc04f848f7f49254e547a8d03651fac554
font_02_sfnt_off0001116d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1