Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9fad3103b36e9d9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 16:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c14141d135c3e9533d8562479b3c35b SHA-1: 3d0628f3058b3d1956c2c30895093d2356b7e4ac SHA-256: f9fad3103b36e9d9e2168e8bff5552792a3c2c178504f84c8498c8e6e8c55bd9
164 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. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'gangstar game download' UTM term in one URL hints at a potential lure for game-related phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d4adc576e---87360086918.pdf In PDF document text
    • http://unite-chem.cn/upload/files/pufezodino.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/58042458828.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/33744902790.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/gesajugifedamamoju.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/posoxotaxunutixuz.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/xopepolovavolitabodukiv.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091810131162.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/mixewaguzid.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/vanivub.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a03d48e7ce---sadununegofujikidojofebab.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/guwakidijavuxug.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/2subafogv53lq0u5vvs1nio685/molasivaw.pdfIn PDF document text
    • http://splogservice.ru/content/file/xubejesufiramuduziwat.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed2bceda0f---detuz.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/90526134127.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/bokutorufitole.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/5968320469.pdfIn PDF document text
    • http://gibisch.info/files/files/24701556927.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/savemeda.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/regaxuvonotituso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=gangstar+game+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_off0000d781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD781 10624 bytes
SHA-256: 5f84ae32614f0577217d177b29cb3cc8f49372a6b948755958ada98caff1f2a7
font_01_sfnt_off0000efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 19140 bytes
SHA-256: 35b3dc2322024a6dc63e6b5ed7f3a42e73da08b866d2586926c2947f0de33878
font_02_sfnt_off00012154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1