Malicious PDF — malware analysis report

Static analysis result for SHA-256 95eb8d793620d6f9…

MALICIOUS

PDF

74.2 KB Created: 2021-09-30 15:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6b9926ca67e31de8494130a0db694ca5 SHA-1: e863f4a51eaa96f50ec8cd30dcaca0f773fbc918 SHA-256: 95eb8d793620d6f9f1b473ee331f86d9afcba328cc6b2f474bce35d81e6aec01
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. Heuristics indicate a 'link farm' and a 'compromised CMS upload link', and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also flagged it as malicious with high confidence. No scripts were extracted, but the primary attack pattern appears to be social engineering via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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 https://irlanc.ru/uplcv?utm_term=multiple+skype+accounts+on+android PDF link annotation
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/87802007873.pdfIn PDF document text
    • https://yodobashi-church.com/putomubemutovusetetulopo.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/baxiporiwogozot.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/92339703096.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144c3890d466---tivonativogenuj.pdfIn PDF document text
    • https://mytopics.it/uploads/file/sezasagiwowuparatopaxipop.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/27411082599.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/41973219768.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/migovugakajebosimumapoxu.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/gafegomigekejaz.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/dojozojire.pdfIn PDF document text
    • http://airsoft1.ro/files/file/46332855785.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/31519376028.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1615001a4d2a23---70521636539.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/10718955237.pdfIn PDF document text
    • http://onelove.cz/file/lifumogukifi.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/lasikidukuginigufewubixej.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/befarutasonefejemowuzig.pdfIn PDF document text
    • http://kezheng.net/Upload/file/sotugijuguwinipuwemifu.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/95008177036.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/68378842450.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395ccb0b90b---85877604434.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/menuzeziv.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/24163725606.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210917/file/fovasaworemumopi.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/zigenaxapedasufewetedaf.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/wogup.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_off0000bae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE6 18092 bytes
SHA-256: a579f629ca15ccd5f9e6cee345fed2051db01b1533f105c55f547568da019bd8
font_01_sfnt_off0000e943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 10808 bytes
SHA-256: 4519b7991e94eb99ca9ac590654456aa5b0a2d83f53b78f860d6864005bcfd72
font_02_sfnt_off0001025e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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