Malicious PDF — malware analysis report

Static analysis result for SHA-256 4196082467efca8d…

MALICIOUS

PDF

87.4 KB Created: 2021-07-04 02:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b5afbc195de15aec64e59987ca9d1202 SHA-1: 86c227240b62d6af8d8078b1b073ef8744b18eec SHA-256: 4196082467efca8d32d5bd913bd15c4f2791e66491fd8868db647088462c68e3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious hosting, suggesting it functions as a link farm to distribute further payloads or conduct phishing. The presence of multiple compromised CMS upload links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160778fdd6bfc3---xogebelaxewerulaxaxasozib.pdf In PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b748b45c1c3---mawovivuwigumajavewufed.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/d46880e804924447274d8d404d8664da/dijigavofotuwod.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/mavinalajafugutex.pdfIn PDF document text
    • http://mamsongdamchoi.com/images/chua-phan-loai/files/gabaw.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/57946993237.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/napawesefefenanopiji.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3aef3517f48bffb96236aa592159350e/xusopenusuwivaxo.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/65383219493.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/jq8v490soneu4pffv8mo1qcdks/23265422100.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15eb441b51---34254404130.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4d5dda8b7---37828001863.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec73c33c7f---sapubawedonomufedi.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/sataxamidimuxadavuf.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609422bbdfd7c---39854237777.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/52b6f7673fd48732170733d85290fdff/gozozilenudajazilipe.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/9408021764.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/f54e32800022b11eb789abee640c4b0e/podisudibojezisavebonuno.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/39276399764.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/28708173382.pdfIn PDF document text
    • http://altinay-law.com/images/file/39971414981.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d461a82e45a---75838655938.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/98065506214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=purpose+of+a+hyphenPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/56611605893.pdfIn PDF document text
    • 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_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 17676 bytes
SHA-256: a89d8942e50ed083eefdde55cf0612d32c88e2a7d8ddac979c025e6907e9b993
font_01_sfnt_off000120db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F2 10436 bytes
SHA-256: 5815f8a7d9e041095ff67fde02ea2bcd2645d8097fb755d257588b85b42e3c26

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