Malicious PDF — malware analysis report

Static analysis result for SHA-256 9146dcfbc81a49bc…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 14:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ba74f2ed7aa07fc1983fdeaacc2cc56b SHA-1: fae764d7bbf81e34d58b1ee660f631692f1c2c15 SHA-256: 9146dcfbc81a49bc3d7d4b62a4afe07e3b296a864180cde06b9bf9107c6b615a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests an attempt to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://huntic.ru/uplcv?utm_term=instagram+hack+into+account PDF link annotation
    • https://art-lamps-rali.eu/files/file/damufowuwidol.pdfIn PDF document text
    • http://grimastone.ru/files/mejigafizewesefazekuraza.pdfIn PDF document text
    • https://clinicscrm.com/img/files/82854037412.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/21849085714.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/nifewijoligekidudifov.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/79570999235.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/ad0ea08c3aa28ded7d659e0743b2e4a6/62742260704.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/majilabimanesajeporojo.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/6327230775.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/17720949078.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/61206239013.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-8/20210908173205736164.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/memabagesom.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/tavivon.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/56916880904.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613864436bb08---81872656937.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/mijijolokafusavuvat.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/kimogirolafolo.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5ef062744---nalenawipitid.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/jukajofoxezivarovifo.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/vomipelaxejole.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/vebeguxa.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210904/16307596089571.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_off0000ad95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD95 16664 bytes
SHA-256: 0849fef6b49955b47d1168d254094f1b6aeea6182d8f140f5fd7df3062f6ef92
font_01_sfnt_off0000d7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 10644 bytes
SHA-256: 0b78b2aa146f3628ed53dfd234cb7028c90c107bb362ffdd5e3197bc74ff6d02