Malicious PDF — malware analysis report

Static analysis result for SHA-256 518b2e384530fc10…

MALICIOUS

PDF

83.7 KB Created: 2021-09-15 19:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 88de8da7505338d3f0b8b62c422c76b6 SHA-1: 8775a019c4e9c21b9e05f9d78dd2bdc10a492038 SHA-256: 518b2e384530fc10893ff39313979e7ee26cb265b05d08477b70c2d60dbd9269
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://garglob.ru/uplcv?utm_term=gender+chart+attack+helicopter PDF link annotation
    • https://ljlconst.com/admin/images/file/zepemexavuw.pdfIn PDF document text
    • http://aurora-c.jp/files/files/lotijigatibijilemidufete.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/tezugojezimapemezoxo.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/34216402785.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/43890933147.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/vovukidune.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/80916602772.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/nanotosojup.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/bexafakadisafulax.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/xetozinipewazibi.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ihde3s4j52tqrl38pg76qvpm9q/77448381649.pdfIn PDF document text
    • http://akademibt.com/resimler/files/dusixajis.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/pofovolew.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/53365508530.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/puraxuxaweziwotovofowiguv.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/70524426973.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/71376304889.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391b292d2f9---34323097212.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/pamakukevidiwinazamujote.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/67549860879.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/eb9rh6t1fdg765j3r5tbgo4c3c/81843493934.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/funefaretiveguwuzivulewi.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_off0000e2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B0 10576 bytes
SHA-256: f906ef012d18328c05ad17b950d1e59fe785c3d59054376e95d20c14dc3a25f6
font_01_sfnt_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 17864 bytes
SHA-256: ec1d4c050a35b2cfac94c0c7fcfaa1deacc59c9cda6239951ab545f6a074ce65
font_02_sfnt_off00012979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1