Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d75e513498a0eb…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 07:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b792c84ccc6c8a7b25479bf75cfc011c SHA-1: 0e4cce31e04fe6bf86c517340b7434629140ec71 SHA-256: e8d75e513498a0eb474f4fd613b5ec1b569ffe99370daada68b4633c472ee1c9
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external PDF files hosted on various domains, indicating a link farm designed to redirect users. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests this may be a pretext to trick users into downloading further malicious content, possibly encrypted. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://rocb-ap.org/file_media/file_image/file/zanufopugow.pdf In PDF document text
    • http://chono.mn/uploads/userfiles/files/30475780152.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613e49418d565---dusitatorifove.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/6835871288.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/44203493957.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/sajonabotelurelulino.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/37940449318.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/jozogiwemivexutik.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/88890091868.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f06245d817ded24a7d0aeb2b49ac788d/wudexinimukibuf.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/dojewolovitagetiwa.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631015525dusomoviw.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/nabuwogukewagedawawut.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/loxogut.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/84870376511.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/nebuxenugugezivuxufis.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/95720245772.pdfIn PDF document text
    • http://195exim.com/datas/files/fatubefukamafurelox.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/vugosixuvujefibalefamer.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///fuvepopanogizoz.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/47731220504.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/052d30f57ad331b7a6bdbe34906de74e/kuxazigelemamovozoxi.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/wikapegoguxovuvotudo.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/72714787624.pdfIn PDF document text
    • https://netlandschool.cl/files/jamavemaviraga.pdfIn PDF document text
    • http://fnathservices.com/upload/file/zofikanotutaveterawebesaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=gardenscapes+lives+hackPDF 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_off0000d48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48F 10592 bytes
SHA-256: ef9e25193b794125ffe21550ba1a33d7daac477a753a339fef0e2962dcc4d07c
font_01_sfnt_off0000eca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 18652 bytes
SHA-256: 13f8142c0c5bea420837c32e3460b7057709bf5f8155b7ebf3b1cf19d9b3b728