Malicious PDF — malware analysis report

Static analysis result for SHA-256 18adb6d7a938e2c1…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 20:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5545882c075cf6de32e3fe3c3b866014 SHA-1: ad8c3aa12839f2f44312c51da0e2cf0797e5bba1 SHA-256: 18adb6d7a938e2c165accce8b352968ee3337e1a1db0b7b978f7284adc4371dd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. The embedded URLs, such as 'https://catamma.ru/uplcv?utm_term=animal+friends+android', are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://catamma.ru/uplcv?utm_term=animal+friends+android PDF link annotation
    • https://vyaspublicschool.com/ckfinder/userfiles/files/dikalijekamiw.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/32407006886.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/86142147643.pdfIn PDF document text
    • http://cjatkinson.com/userimages/52108841016.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/dipat.pdfIn PDF document text
    • https://ancoraeducacion.com/images/85939258895.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///44715278334.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/84177722768.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/21928288064.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6defc601100f780e6dcfb091c4823eca/xubawa.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/49626915673.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614405cb4b503---numule.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/28559311430.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/33220086167.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/65488581549.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/87e95e9142e2f678cc7f57883bbb8eee/65806153757.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/86746604763.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132455e1d849---xezidenabebunedogex.pdfIn PDF document text
    • http://imaginove.eu/data/Files/94403821042.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/bozuligijedaxuteka.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/63319024597.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/betusivepet.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/57451379786.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210917004726.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/maxujetuxelodemapugi.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/fegab.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_off0000ccd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD5 21948 bytes
SHA-256: 3702287b67ed0c9b62d82169f7dfacb474eebe3fc8f96e26e8d66a742aa74924
font_01_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 10400 bytes
SHA-256: 7734054a976d3817ecd9a89d75aa4a20178b26a850368d8e95ab322e8229bbb9
font_02_sfnt_off00011d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1