Malicious PDF — malware analysis report

Static analysis result for SHA-256 7695ee1f958380f6…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 14:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ec0029b2d88f4e83d09493ca856023d9 SHA-1: 615ef816cef510dc1cd2e099c947188ea6f58ffd SHA-256: 7695ee1f958380f6a66b5d95f14811be62ced323396ac8483a1898ab4baca79b
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs, such as 'https://queure.ru/uplcv?utm_term=games+play+offline+free+download', are likely intended to deliver further malicious content or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://queure.ru/uplcv?utm_term=games+play+offline+free+download PDF link annotation
    • http://namadagaskare.ru/ckfinder/userfiles/files/56241115138.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/putuxab.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/97681278700.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/kanurirekenir.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/modatafevuravalolivepo.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/50632562141.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/zesuremigitojadu.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/tajabemuxi.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/b7d03ac534770ff7d8a048dc4ae2ecf3/texupudedafijoti.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/mijizam.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/luwixomefifimoboj.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/15161822756.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/60727256954.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/fokebisemetovetunonunuse.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/96704566341.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133232ea8944---dizawig.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e26a58db3b---zipibesuxuvinodegumowir.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae3395d0c337109299e23db3492963dc/pogekoze.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/zebabedepuguzedekux.pdfIn PDF document text
    • http://goldmustang.com/files/files/1106080314.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/22299653926.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/pinagun.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/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_off0000af79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF79 10800 bytes
SHA-256: 7726541f172557d74334f9a3383044578a1d1e9fc5be413b1132be1162c41433
font_01_sfnt_off0000c85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85F 16584 bytes
SHA-256: c9e69313c119051a8c38d33b44bf399b6e0d51fc54be66b704b89fbc681e79f2
font_02_sfnt_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1