Malicious PDF — malware analysis report

Static analysis result for SHA-256 659b331595e93374…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 21:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 32a67f10e3b087be210d713c16c1b97e SHA-1: 437644927bb50421f4b3cf6286600a41ba3b0586 SHA-256: 659b331595e9337462d2f0a8b83725d77280e75c046b0d9fe3b57c938a24bcd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of external URI indicators and compromised CMS upload links reinforces its role as a distribution point for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=naruto+senki+mod+version+1.17 PDF link annotation
    • http://christ-china.com/filespath/files/20210901101807.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfa8fae08b---kerinitufez.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/xojotemolaru.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/b18718aee0949624f68849adb9be84a6/timodogobesogifosavip.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/tezodawimemanameruxelaj.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0cfe5c85a---pokeladigel.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/bafexisitetiwi.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/21828092700.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/28547712747.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/55020940133.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/xodoluwavikobinalavijak.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/sumigufasofejesidak.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/pexorezamanunaxiwilomonel.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/60471797382.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/37699175269.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140082c91a1b---namelabafakex.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/55504489386.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/dazugemusupamonulovuvijis.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/75532098081.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/4381565197.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/xaninusuzopineb.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/91tjb53v5tap7kfkmdvk0ddjvm/banotodedufa.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/12352689244.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/vibiputigofexumu.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_off0000dce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE9 10764 bytes
SHA-256: f6473082c7b40b5de04b5b0b853f17ee115c537c8c44644b9644d8a7afe9952d
font_01_sfnt_off0000f5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D3 18656 bytes
SHA-256: 1c1c3f3c86af8fb1defbeeffbe0bad1db1334f83a840c0289fb80743446c8010
font_02_sfnt_off0001265d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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