Malicious PDF — malware analysis report

Static analysis result for SHA-256 07764f326cf08a34…

MALICIOUS

PDF

87.8 KB Created: 2021-09-09 13:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a1933f57e6339a58c66183e75ed67a5f SHA-1: acc2d184675ff6c1cc82a5466368294a40cbc40a SHA-256: 07764f326cf08a34e64d3a1c81522bf666a07559b1523050d38140be4dd9e5c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to external sites, some hosted on compromised WordPress installations. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ikima.fr/uploads/file/renozunilasiralodagol.pdf In PDF document text
    • https://1877painters.com/FCKeditor/file/perebinejeg.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/sonepaxawigop.pdfIn PDF document text
    • http://woykoff.hu/upload/file/metopilubigo.pdfIn PDF document text
    • https://photofetimages.com/61433496808.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/lulibixegasogudipor.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/titixeguvowatejalepesasoj.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387b1e1b73d---fagosexosorozejunedefu.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/zupogufavu.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/48cf4c2635dcf950f2cd86d5042e4329/tiborijirova.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/bemonegetaxojowipepurapu.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/puwokokajojexudokorovi.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/lasopajibed.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/7162510513.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/zurufasin.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135333ed80a6---fejiden.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/33120097434.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/73245992659.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/lufupagov.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/74323822357.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/vajokoje.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/89461716725.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/19281170025.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/rusaxodojegoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+rpg+no+in+app+purchasesPDF 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_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 10732 bytes
SHA-256: 576d2067bf80ce9e0bb67d7f968911b08cf3f74b9ec76195e3168fd6627cd120
font_01_sfnt_off00010c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 17412 bytes
SHA-256: 0707dd761f009e18125efb12c17682f2a93cb8b0a5a3c6adade62147c02c1c9b
font_02_sfnt_off0001393f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1