Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f0340dd1207cc2…

MALICIOUS

PDF

79.9 KB Created: 2021-09-10 07:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8f1367c325112e75a1e2ea6d370be6bb SHA-1: 63b346bd875795a22a5917c21cabd448da41ac0f SHA-256: e7f0340dd1207cc29ee8987e3c47f984f9304cd761f6fecfbea0cf07ca5d539c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to external PDF files hosted on a variety of domains, many of which are flagged as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document's structure as a link farm suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ngor2-3.com/file_media/file_image/file/videpaxonoretan.pdf In PDF document text
    • http://etre-belle.su/images/file/kufixukogitulasubatigog.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/9573187170.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/76058576854.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/bapegeviretis.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/zutexalepijegebaxijum.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/kopakagozozenofa.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/monajiridipigevijupod.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/33120097434.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/gelune.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/lubunolegupovebalu.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130a8b9f25f5---pidiferurorofemubetepo.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/jijulen.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/jomujavupegenabatijoxeb.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/67413798740.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/limuxonogabofazanif.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139d4b73268f---76071695583.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16133628b362e4---bufijamelepolubewaxomo.pdfIn PDF document text
    • https://cubic.is/userfiles/file/debigujawumatipimomix.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/r87pf0lpceoghv98s5g5ibkilp/5651464789.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/84824749515.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d4bcb51bff20652881ec52648620eab7/vukopilojokinaz.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/wamofubonevuvunefubupej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=datenrettung+f%C3%BCr+android+kostenlosPDF 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_off0000d0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 18196 bytes
SHA-256: 6721357d4bcd5ca20ce3badfba7eace39d965810b20922135ac7d04ba8226df7
font_02_sfnt_off0001170f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170F 10916 bytes
SHA-256: cc079c2a6621a56956fa9e87645018e9160f36451111c86d8a8bb69a5a295f48