Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04d97c4348964f4…

MALICIOUS

PDF

76.9 KB Created: 2021-09-06 13:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3484a9dac7f26b67c8dc31410e8a3f84 SHA-1: 97d61987eb35d26bfe60c7889f83b5a976a37110 SHA-256: a04d97c4348964f4003260822832450d2d8b2ff12c34a1e92a401f1269f5ba74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous links and the PDF structure point towards an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=basic+clinical+laboratory+techniques+barbara+estridge+pdf PDF link annotation
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a33bd482299---tifunuvadi.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/dexobomevuvatixawuro.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/89023238155.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/xeravusawamarin.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/aaee79de0ee52b5849a2ff62196a4c8f/kejezovozesasuviz.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74fa01b44---sinuzefekewiwodisupaforu.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/5af3db0f1aeb0dcc45938d8b5f913470/30155256827.pdfIn PDF document text
    • http://pinxedien.net/upload/files/1592343006.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/jegapodumopimosifol.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/jifuzawepi.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/39496990850.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/11078267280.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/4965c21391d31969de34c0385c446360/dofepeparujamipurivuso.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/wotuxenedobulukuj.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/juvetepe.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/92057155963.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/porupuradokadamoti.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/9419752390.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b97343670---96783770832.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086a9dc31093---45587669109.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/napowokijujunuvez.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/wonekezedaduvabi.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/8cjspkqrecujk4rhh1bgjvtmo4/gaxadeg.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/70167717367.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/46670874981.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/pokididokotof.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_off0000c675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 16996 bytes
SHA-256: fdada144c2431e9237854c6e611239911a3a9c5399c524418a6b0563086c89ac
font_02_sfnt_off00010a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9D 11452 bytes
SHA-256: f6a32b4802ec1a58460e69e03e85a5419c123d5f040baf513ab3b5bfc083915d