Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b163e7247f1ef0…

MALICIOUS

PDF

102.4 KB Created: 2021-08-08 20:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 5dd66341093bf488dadab8e2e55c504b SHA-1: 32926741dc9f54d272454f442ac62e46214eb142 SHA-256: 97b163e7247f1ef050ae6b6cf62faec838f943c85f9fb261774ff2f268af6475
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://laborke.ru/uplcv?utm_term=gato+de+alice+no+pais+das+maravilhas+frases PDF link annotation
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/21820760876.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edd02d0f15---wokareve.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f9ba68189---rojutadedawajuwutivawe.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/4a9119f4ab62147be7d65c92c7df21f7/putakedesukubogufozejikot.pdfIn PDF document text
    • http://nessium.net/userfiles/file/69250074377.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/17d763f0e34b9a04fee885ff2425d8b9/kekasinerizanujitozisaf.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/63767647093.pdfIn PDF document text
    • https://fotinepmuveszeti.hu/kovagoors/uploads/files/ragenosotegew.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/649ba019979629a9871e1560a0bee252/pinutixagitavewutusojeb.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/44237887612.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b4442a938c2---gexetesotu.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078a0a75f085---lujapikuxiloxodoza.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/30607218389.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9bc16ac8---wumopawisokuvujitonis.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210807062841_jsb9ue.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/22932016821.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ddd4d3ac461d3c5a3b2b9494db94b1b9/74368991268.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/60696883512.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/pededekiwukopemixi.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16094552197722---57512133209.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/87714648454.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/94105260731.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/is930jg50oc3poriomkkc7l7s3/71569195369.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9369b7260---wojogis.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_off00012287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12287 10988 bytes
SHA-256: 617bb27598f94bf5b83493f31cf26b23f1c0b224e730701fdbdd975f63b51df7
font_01_sfnt_off00013bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153EE 20776 bytes
SHA-256: 1a427603d24c102d01db94bc34c13b61090b70d9ea12e827da308c9b8bca4477

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