Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a67f0f0b939205…

MALICIOUS

PDF

73.6 KB Created: 2021-09-14 01:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dba6eae5638575dd70498e899d732f2f SHA-1: 75254e48f5a8e961043d2275e7ebb2ad6b6ec6a5 SHA-256: 95a67f0f0b939205c63395d934330422bc4f681db4c526ec55618556118adf34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple disposable hosting domains, a common tactic for distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure suggests it may leverage embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://otestmanager.org/club/data/userfiles/file/20210909173824.pdf In PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f844268d1c---fominusagufaxutodelurifir.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/disepozupimijajew.pdfIn PDF document text
    • https://actorconseil.com/files/file/33460897096.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/nojomazupofewomowa.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/sodibelelubuwokatomafeto.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/36959373976.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/66474674695.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161379a25836f5---kujelid.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091208444020.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/52690946577.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/25450360867.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/mudiniv.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090703325873499.pdfIn PDF document text
    • http://mc-opony.pl/files/file/negeniwatoloza.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/16554982495.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/pevodamifijebuvinafid.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613610995792d---17307148032.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/jagudazetefogasu.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/pifukabinofevozeju.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613292cf248bb---83894007269.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/mufasiroliv.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/1124056205.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/mijusakabedesudupup.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/64797809218.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caa1886d43---70744204883.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ld0ab4fnii2m2835effnukahpi/rasojepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=black+market+apk+free+download+for+androidPDF 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_off0000bc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8A 10844 bytes
SHA-256: 0cae11b99e53e9a338eaafa74b0fa6bbf1346047613c582e426c9878583b8630
font_01_sfnt_off0000d59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59B 16696 bytes
SHA-256: a4aca1ae1828e6a52e741e21db65a4c97d5c8f483d060648e8f4e81e649ab0d1
font_02_sfnt_off00010074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1