Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15895f18e5ed6f1…

MALICIOUS

PDF

96.7 KB Created: 2021-09-03 04:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8148aa669c29a71b52e35ee4d7f667d3 SHA-1: bfa575f5421f2fa616ab1701baf665d99bf73d56 SHA-256: b15895f18e5ed6f1541cc4d4c6f7415bf3261f1fe401c06e55ab66cb3f838f10
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farm heuristics confirms the document's primary function is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107b6040a42c---lupexidigomoxuju.pdf In PDF document text
    • http://artospace.com/pics/file/74691431488.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/pakoremelujodimudoleji.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160857be834fe5---jabajukefuzulodexevuvu.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-8-20/20210820105554575042.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/punenifazam.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/momaniv.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/49566738875.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/figazesokiduw.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/pifavafagu.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/93614236697.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/burixejido.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/sudilowigafakox.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/37104579224.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/zatisavedibeniva.pdfIn PDF document text
    • http://fultonhighschoolclassof1977.com/clients/a/ad/adf64365ba34d951c098eb677b062caf/File/31932948993.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c34ba04f74---19360341211.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074112838d7f---26953278406.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/xatadasexatawaledanonen.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16105e58e1554f---36511568340.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/185c08650ec7cc9eb3ed676d37814c18/5344470541.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/15863295561.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/89509840155.pdfIn PDF document text
    • http://chamdure.com/DATA/files/33058611129.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/36387150263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=two+wheel+tractor+parts+manualPDF 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_off0001168c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168C 17632 bytes
SHA-256: 04506f3cf831c3a4e466dd31fca3ae93730fef8b12308f101ec4d52113d36888
font_01_sfnt_off0001443c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1443C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C53 10696 bytes
SHA-256: 19933f2ecbc63be5703a382adfefe0d1c61301ae8b2c331c0aa53d21a95d4989