Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5728e438e41be1a…

MALICIOUS

PDF

168.7 KB Created: 2021-06-28 23:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f72b15e2cdec9adbc975819ece376d32 SHA-1: 0ed7b3e4c1ebaaf95e2c5afd1b0fa5994ec76dd7 SHA-256: f5728e438e41be1a91e6e138522b58d3b8871c815aa6f143eaeec5d97ea182e1
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised WordPress sites, directing users to potentially malicious content. Heuristics indicate a high likelihood of malicious intent, with ClamAV specifically identifying it as a phishing trojan. The ML classifier also strongly flagged the sample as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089d06c2ef7c---vumowobi.pdf In PDF document text
    • http://erbamedica.org/userfiles/files/85419805971.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d57caf04019---44912524602.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070d8e661015---jamozamal.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/8974012221.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/41b7cabd7fd8b987191805a1cf26fd4a/17360336470.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d76abfa7dd6---83630251261.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/602f8f7fe6960bd702e096d17a645897/vixafigozavatuf.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/fakakomamigigitubotazomag.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/meg6misokiftecirago5fp1oer/zonipetabibesosofeko.pdfIn PDF document text
    • https://tmtteks.com/files/31466674095.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac77180e3e0---23020116658.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/61441314745.pdfIn PDF document text
    • https://arabacioyunlar.com/calisma2/files/uploads/belumaridotipo.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbf4dc0c60---roxubobedovazirapiwifol.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/58102908633.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/9ca27560d02be141d26952e6ad45f357/91302680786.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/52149643313.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/c29c479a54a36fa9c5b456ed90e0309a/1045837337.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c559e09f4---48796463407.pdfIn PDF document text
    • https://ptogel2.com/contents//files/43259752806.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/67b254b4dd42b3492dff580ff23430d1/fuxafijidefibebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=define+kantian+theoryPDF 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_off00023616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00024e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24E28 18016 bytes
SHA-256: 8466495c4bf20c182b7e3c87850a545b202b26f86c4bd241df1e8de7143f9dfa
font_02_sfnt_off00027cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27CC1 10304 bytes
SHA-256: 2059a11bd21d4346b046f0334a4bdc3ecb43755defdbf70c269a2e2d27735cb0

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