Malicious PDF — malware analysis report

Static analysis result for SHA-256 449b80b49d048c3e…

MALICIOUS

PDF

79.3 KB Created: 2021-09-08 22:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d438e1b9bebbac1fa22f404e7c5ca517 SHA-1: 564dab9008f7c6631724d3f1ed0bc2f693df5512 SHA-256: 449b80b49d048c3e768e4cebd8ca58b52f1e46ac0d9ffcd7614b19b4ec39f9dd
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content or exploits. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://thefertilizerequipment.com/d/files/zilurimowexal.pdf In PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365b47de413---sasekisobovepag.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/1108155009.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/57629603825.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/gukilomazupilivanusut.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/wakoso.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/mefixem.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/e8b877b52c697be6dd0cf81e07f862d1/214340800.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/xotobamitajovexosugagaz.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/sejasupotolugim.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/jamopesorufolemus.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/buropuwepifavolusupolowo.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/ginufuxiz.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109020005099268.pdfIn PDF document text
    • http://intertravel.hu/_user/file/vufinazapipiponaparepomaj.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f1ba99c1---bifizenine.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/munisej.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613651846d184---2151917590.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/20848581090.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/jufipiverajikin.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/1115610565.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/weselevupuju.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/fenifilobefukimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=temple+run+java+game+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_off0000d0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DA 10720 bytes
SHA-256: 8c91f5ed18824308b1adf8d60bcd11918356ad487f82ee3a560eae4048e35567
font_02_sfnt_off0001013b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 18064 bytes
SHA-256: 47bc751a0946d3ea8576a8a975ee97610b00b53f5413c994860649f2f6ec9a1c