Malicious PDF — malware analysis report

Static analysis result for SHA-256 5197c14c9742f3c2…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 22:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b767a28096c7d04c62eae92f53459b9b SHA-1: feaed74154eccdf1604c74266a6b17763e0bd732 SHA-256: 5197c14c9742f3c252812d8ec0899a8afa0c25a0ca3bb847808c367f0451b6fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=voice+changer+live+streaming PDF link annotation
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/76573044960.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614bad1e944ec---tuxunodedus.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/zanib.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/37751445956.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/70011932493.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/vifujozufawaz.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613b06fe0aa00---1684094412.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/10115973915.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210915202838_1109438379.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/42197079728.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/noradokopagugafub.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/84069414932.pdfIn PDF document text
    • https://remini.hu/userfiles/file/47506687409.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/21320974447.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb40dbbd66---75208516686.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416a7600747---venekaxa.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/21460357257.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/39063653100.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/81208512391.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/vapoguvurulubuzosamodaz.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/xobugawimixemuxefu.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/tetuvaxajosufedipibojabim.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/75175622385.pdfIn PDF document text
    • 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_off0000af76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF76 10712 bytes
SHA-256: 23edef17941b1eadcebf14f970248431983c3ee5769e71929022ac5cca284e85
font_01_sfnt_off0000c7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EC 14892 bytes
SHA-256: 217c4dc8fd723d048610d853925d8b8fa3f103c92e95248ddb531f27ea8c2357
font_02_sfnt_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1