Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ac582648f70867…

MALICIOUS

PDF

84.3 KB Created: 2021-09-12 23:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 564e767b446959215eb38917bcc9f5a2 SHA-1: 53e89741203a870aa446f59b130525a847940bdc SHA-256: 53ac582648f708676443351302adbcd69fc090667cea65b13b506c81e1ba6a06
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links and the overall structure strongly suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://marasintl.com/public/ckfinderuploads/files/motozuloluganewixur.pdf In PDF document text
    • https://gazeta-msp.pl/user_files/File/jajixa.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/vimawet.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/seripukegazetubebel.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/juwumawodutupow.pdfIn PDF document text
    • http://wamer.org/userfiles/file/21881742096.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dr589g1uuuou2pk7qivg7t4hi3/xidipumiponomiz.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t9ujcus8kifmgmrqa7dbfp60v2/62439195018.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/49659566884.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/gezev.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/laxaxorugavuwobukemex.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/47602925956.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b16b205236---16347619687.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/6d2335418f933a072115cdd36035dbe1/feteda.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/busukexejulidoxujote.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/woteladarelelemewe.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/30194695170.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/wuligekaluxesilirumu.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/fetumemew.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/42643502150.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/nutuxatedoworud.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72043211019.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/rabijozetavefawav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=gyroscope+fixer+apk+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC74 10948 bytes
SHA-256: d07dd2fa83ea1deecdec65ea1fe5b6141b46e173652a06bea9fdb7fa3014a040
font_02_sfnt_off0001160c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160C 17324 bytes
SHA-256: 69a6663abb1fd92718daa38112a4af817a62ff45f670e2a61f76b8b43a9e76d8

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