Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d2e96cf0b440378…

MALICIOUS

PDF

102.2 KB Created: 2021-07-02 16:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 357c5665ce4b834ceab791fc0c154b71 SHA-1: 66863cb9a08a47b2ed4fd8c296c0fce27b0b958a SHA-256: 1d2e96cf0b44037873368eaa3b062b4128a64be7e15c4319358913aaa585ed5f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, likely intended to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the presence of numerous links to potentially malicious domains suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/001dd0d6db561827213c68936c0a9bf2/turunanedetemogaf.pdf In PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609b05c0f14dd---sixux.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160758bc5ca7e1---66027999755.pdfIn PDF document text
    • https://thenavyaindustries.com/ckfinder/userfiles/files/wikatos.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/sirewokir.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/tenuluzuluxujewoluvup.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210604232557_9m0e8c.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3316c1f5e---pekixifev.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/28262432823.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/zorujurinuz.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160781b2602d40---lobubukel.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/q5791tbil4pc7cntj6tnpk53r8/93194330833.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c69d8250c604a4ef3cc4c361d0a9c0c4/rolovevawap.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/17lnonjd22gac957oiq13rjdr6/40515593087.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/59595378353.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/welipigezete.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609822b64781d---53490452319.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/li8i74emr2v7rmgtgp4slatbpu/favivosomagunepanaraka.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b06a309f9f2---39454587357.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/vemazenomi.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/47134577082.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/17219158110.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078434e238ec---jobax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=picture+resizer+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AA 10060 bytes
SHA-256: ac3476bab2405dfbd100932f621e821e4644eaba97728c3fac2092fc963543f5
font_01_sfnt_off00012f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F39 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off000144af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC1 17776 bytes
SHA-256: ecb24636874a6546e883427b96b5208c7b03b707648e930a52d560109a0b72c6

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