Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba7e72047df3cff…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 19:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7335836dc60049eee1b709bddbc1b2c4 SHA-1: 26a6ed77e1e283e56ae4d50f72de4fcfe1abdba7 SHA-256: 8ba7e72047df3cffbb34a2eb5b598c7cf6bcd06868861559dfc13d4805cf4736
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggest the document is designed to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 http://salman-group.com/userfiles/file/kidopebenogowilezaxulob.pdf In PDF document text
    • http://tabletopad.com/images/file/14684888704.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138573bbacf8.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/98815027233.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/vupaguliminuduxan.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16140275100a77---50394485841.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/13675209716.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/logiwike.pdfIn PDF document text
    • http://teplospectr.ru/images/files/75199036752.pdfIn PDF document text
    • https://majubesar.org/contents/files/jetijaxukajogitof.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/kisuxanosipafaweno.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/vikanutizop.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/60151573294.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/0fbl06ut2avtp74thhea8hls9q/funugupotopimoxajozonorez.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/43841940431.pdfIn PDF document text
    • http://fluorescent-training.com/file/simibiw.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/tokafutov.pdfIn PDF document text
    • https://ancoraeducacion.com/images/92443885702.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/d97655f759393178cdc3e3813579c12b/67945126213.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/wusagoze.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/2031430863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+select+several+photos+on+macPDF 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_off0000d0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B7 18352 bytes
SHA-256: cb65a0db73de91e522385c3caa20d29fc52945b74157b961b3433f9c176188c3
font_01_sfnt_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 10688 bytes
SHA-256: 30b5be2b7f41eba8862afa339d320e9dd100eba9f5cd965162ad83426376ee75
font_02_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1