Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d64d3d0c170b71…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 07:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05aed335578720811abb2b440d691966 SHA-1: bccbb57077ccb525d480e666fcb94000fe466b0c SHA-256: 52d64d3d0c170b710cf73304858661a89ec4e429fbd5823546add5f06623221c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm or hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this conclusion.

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://psychanalyste-gard.fr/ckfinder/userfiles/files/3913790330.pdf In PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/28991199688.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/bomowufexebomoveno.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/5116925429.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/3516101346.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613549b3efc3d---mulomobuwitoxuzobaju.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/pnumr3hu6lb7gtnr49s2k818rh/31375484203.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/99027029752.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/13424020825.pdfIn PDF document text
    • http://dges.in/userfiles/file/kupunebizajar.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/33437474566.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/48311169195.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/94008884447.pdfIn PDF document text
    • http://surtek.biz/image/files/20150325_110852.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/tutixajifexepujuburorefu.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/95156132500.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9f89414afbb6cd6bf63d19fb6bac9196/97377995812.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/gezebusaxadi.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/nasosuxibufikakesezesovi.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/lugudavitipiwurewodazex.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/1594507226.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/fafopakatijebonona.pdfIn PDF document text
    • https://huanghecables.com/d/files/tudajitasetotuvipumidava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=internal+storage+android+selalu+penuhPDF 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_off0000d356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD356 10720 bytes
SHA-256: 5d55b1ca74f628b5e5b1efa4e1da6251b8df9ed4c03acd292f1cb41406c248a0
font_01_sfnt_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 18428 bytes
SHA-256: 02ee2dc40cf3a0b9211e64f8400574aac62ecfe81f8037273d6a4988ff96e64b
font_02_sfnt_off00011bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1