Malicious PDF — malware analysis report

Static analysis result for SHA-256 864142de935f873f…

MALICIOUS

PDF

73.6 KB Created: 2021-09-03 00:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2e0af35c0f0047759fcd1bdff14b8d1 SHA-1: 03ee988ead8b0da09079998e8f0df178d83a02b9 SHA-256: 864142de935f873f9f4b62d40c08cf29f92cb13d85bac924908954cb2f335700
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to external resources, many hosted on compromised or disposable domains. The presence of multiple 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://addsfly.com/userfiles/file/wigipomoxasebu.pdf In PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/10350024790.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/4465122728.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af75593447---tifimukedifosebazaf.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/89282165325.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611b944106bd6---kejapodu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01c0487d1---fakajedanu.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d95de6d5de4---kulefokones.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/39677577865.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/rixonotudilufu.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/22479632211.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/29592949349.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/2220096981.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/87870845151.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/xotutukebijoka.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/muzegufemibezedo.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/nawuxenekime.pdfIn PDF document text
    • https://tepihtrava.rs//files/11804494339.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/74065926375.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/oh6qpftvb635ng6mjmcdbjm6da/70726046006.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a619f9e0a77---vomarinin.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6570f25af60f35de1e1aa0d62eea9f4a/zafas.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/gepubuvuxudakopefavewon.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/73614293066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mobile+computing+tutorial+point+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_off0000bf53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD765 15652 bytes
SHA-256: 5bc930b42c05c57389c89d10e9e48ddb6d6fa5b3e2bfa23d5169294d167f1411
font_02_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 11028 bytes
SHA-256: e543f1bb64849a32868fdefc8c81232186cb8876a6c58b17e7e341c7c081a5a6

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