Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b20bde94674ff6…

MALICIOUS

PDF

88.2 KB Created: 2021-09-07 20:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c1a9058a06182ff81086ea6af6747f17 SHA-1: 88d55e97220738c2caa4b8771237dc5564f7e5c3 SHA-256: d4b20bde94674ff68ea17eb057a98855c658eddb142ecf51f924cc7739c550fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c585bccb4b---zamubudosemuj.pdf In PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0d7301ac23e492c99d44d0ac0003a53a/15978801480.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/32707266746.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202108251954437048.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/65660052554.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/90377289651.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/repomo.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/8773473339.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/21690223629.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6867f029d5---83996260085.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/tazedagokopu.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/26026912787.pdfIn PDF document text
    • http://venkateshservices.com/uploads/49446701499.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607174485fa88---subofijelikokudupar.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/vhbsstpvmkhrh7c8hfdeqbrhal/vilon.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/31133876559.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086856cc73c8---mutavepasapilewededin.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/bisemuwajex.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/tozur.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4a17e974f---ladarukununowo.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/tuvakidakojo.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/16388234285.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/93585712563.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/17471326651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ut61e+multimeter+manualPDF 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_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 10308 bytes
SHA-256: 45bdd1625bf5969238c3d9d70fadb48e7140d571ed8041018824be0b92c9d578
font_01_sfnt_off0001089e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B0 18916 bytes
SHA-256: 8f8cfd97e1f5932575c5181fb123a1e8d889edd0c5786a366f1ebdb9ebf19f9e

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