Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b8e2454de032ab…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 16:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 01e323226b7ba448ad5daa9ec83203a7 SHA-1: 1fe7bc3c11d356974480e0a9098adda61ee85ee4 SHA-256: e9b8e2454de032ab9d390e7073da662b826deedfe58fc3ea078869d911b08ae5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of numerous external links indicates a redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://vgi-vn.vn/app/webroot/img/files/setosiwibegaduro.pdf In PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/it9b9t5rn5611d23t6ojofk63p/gafuremidozefalaf.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/dopalokeputevuboj.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c45ea3b526---22917323223.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/43518805852.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/64aga5rqg8pk69etbuekkrmkn1/favajimur.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/27414667135.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/57981767657.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/vakozirejimefofab.pdfIn PDF document text
    • http://4bx.pl/public/file/97017765197.pdfIn PDF document text
    • https://petala.gr/userfiles/file/wodowoka.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210714133803_k9ajmx.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/newuwebiperojo.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/morir.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/282b31f79a96016bbbf3aaaa4bf65534/76065852350.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/vezine.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/52749669168.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/bidijule.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/80117361831.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b18b6fcd701---8691156362.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/fawofumodididesujo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b228472087---tokugopifokixunosuvivazib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=marxist+analysis+and+social+anthropology+pdfPDF 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_off0000e5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D3 17708 bytes
SHA-256: 4cea2bb2a04d3a3af9c48828fc3db42fa145e55198f2ec7c64696fefcc7d6b6f
font_01_sfnt_off00011391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11391 10976 bytes
SHA-256: 348a13b2975fdaaf221f5952e253cc40637de461213ec0ab49179563784b4281
font_02_sfnt_off00012cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1