Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f0a4965721d990…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 10:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ca6b58a5027b2a36614bb1161a8fd11 SHA-1: b74ea8b4bb11f6fbae1e6b1f6ab9cdaa812ab090 SHA-256: b7f0a4965721d9903eee77dd297ed6769b60a753062c5bf13468290c40384aa1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it functions as a link farm, pointing to compromised WordPress upload storage and disposable hosting. The embedded URLs likely lead to phishing sites or further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416c5793992---siwul.pdf In PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/wenilifefa.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/keduwa.pdfIn PDF document text
    • http://recviem.ru/img/upload/5088324730.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/16262655413.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/liwupimerozixasurusunoxun.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/puvanuzewepi.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/tejuguxutikanukalufipin.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12535960096.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/jazobuzawuwujov.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/683f45bcc46246c832243349752141f9/xoxadebepipupikapupisaro.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143269f00c6d---9307080127.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/xesodevigema.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/85507780664.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/xanapanadedobetalikibojov.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/60892721146.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/31953228954.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/pevofedujuwivamigokijis.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/61692799234.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423b32c43fd---vafolezufiju.pdfIn PDF document text
    • https://airbays.com/userfiles/file/51920199078.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/51847989113.pdfIn PDF document text
    • http://maksimetall.ru/files/67169921989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=%D1%87%D0%B8%D1%82%D0%B0%D0%BB%D0%BA%D0%B0+%D0%B4%D0%BB%D1%8F+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BEPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE27 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_02_sfnt_off0000e39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 10884 bytes
SHA-256: 8e9bed9738c15b05f0479c94422ccde541cacd22020cd81dada0b414230d6400
font_03_sfnt_off0000fc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 20744 bytes
SHA-256: cbd7a8a537b6b15b377541504eb3e40021b276ea2f67e01c5fdea755a30a14a7

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