Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b603972740bc0c6…

MALICIOUS

PDF

77.8 KB Created: 2021-09-03 08:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cd94390a6f8c552586c45f294accc587 SHA-1: 08640a1212d27450e1278a33978e64d328bdba78 SHA-256: 3b603972740bc0c616e4e7066fc3297e5e2965757f523ad6afba303d6ea195fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external PDF files hosted on potentially compromised or disposable domains. The presence of numerous links, including those pointing to compromised CMS uploads and using UTM term redirectors, suggests an attempt to distribute further malicious content or phish users. No scripts were extracted, but the overall structure points to a downloader or redirector role.

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://chineseclothingonline.net/File/lozirekewelabisedasanuwu.pdf In PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/wenuxe.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/20fde73bda9308b338f71725d41115e3/92610084180.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/00243095cbdd935e8efabf3693eba3ab/revudebekolazi.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608da47400f7c---fekuwopiwurofo.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ddec77b862---fositotobifutumukufedola.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a3be65be---futowemuwajunewud.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/mejojobisogel.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a23089c25f---sexuditajemolaw.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b4274b3f794ba59d678c12f8d22269a2/jeneforused.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/gikakenixirafefarepaxijo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d638c9ed1cacab21d1d0221deb0f1cb0/93072253624.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/vabiwofukatojatezajav.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/pjig7rmdn10la17tvqtpc47shp/boxeranamewemikalefizoga.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210813_112956.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/10312593404.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/98082597997.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/c0f79e731549fda435d55e5e65a4e8e4/46500937038.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/wewuluwijasezuwoza.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/vodizivedobinomu.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/52146032204.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ddf03ea6b2775fea11028de9c778c7cc/71505046615.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/xukezol.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160886eafb55bf---kuwudato.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac63c78c782---rekifak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=reasoning+book+for+ssc+cgl+pdf+downloadPDF 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_off0000c63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63E 11060 bytes
SHA-256: 3ee50f28fd7089ebd9137a94b763e7fedc2753aa5cde5d7bdb9e8ecb7d389c56
font_01_sfnt_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 18792 bytes
SHA-256: 4cfd048ee7412d5d8e864b446c7bba5fedfe4ad9847443eb656bab73b476eb22

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