Malicious PDF — malware analysis report

Static analysis result for SHA-256 561243aca3a9ea6c…

MALICIOUS

PDF

99.5 KB Created: 2021-06-26 03:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c85fa755c750556411eab11adcccdfd SHA-1: a7d2da884d2ffd26dc1054b09aaa3fcb441c9e8b SHA-256: 561243aca3a9ea6ce1e35d69478c19174b9b6c088619ad73d44f03d4dd28650d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters in some URLs indicate an attempt to obscure the final destination and potentially track user engagement with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/gor1qanhhf56emusm243g58gk4/66507646299.pdf
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/obd14oqjf2qm9ml0jiiv3mkurd/naligoletifoverujagiwut.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9a886f4c2---titufene.pdf
    • https://chmelo.hu/sites/default/files/file/40611381217.pdf
    • http://aldara-latinoamerica.com/userfiles/file/vawegamebusuzipefumiv.pdf
    • http://glassco.ca/clients/9/99/99aa1728c1dafa3cf8773a75727b87c9/File/29312612416.pdf
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zevevo.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608377d109c0a---kixejesawuvimi.pdf
    • http://mytmbc.org/fckimage/file/82108114157.pdf
    • http://tuzvedo.hu/elemek/file/77049366064.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d26c7cd784---24434687530.pdf
    • http://www.asslar.de/downloads/814309139.pdf
    • http://kryotherapie.net/neu/userfiles/file/64594425809.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd85f09028---xirugekoribujoduwud.pdf
    • https://optimustelecoms.com/ckfinder/userfiles/files/gafawadezumuduvox.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16071cc2fb8f20---79985724633.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e137576d33---rufadosedenogosi.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/11184502146.pdf
    • http://adabaskimerkezi.com/upload/file/dusepedemowinig.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ec1edfec92079858b57666723809c02c/56953400897.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9b112ffb2---xivegiwedu.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/0fce8675b27b61daf95f2bbb0751cf3d/tezixibufitog.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/19c3222cf304c01a102c5839bdc1efb7/63502807193.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/84537215971.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=write+up+for+employee+award+nomination
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012034.bin
36556b10247c3c45b89c3df988b275dfd7cec2ee4684617c9b08716d730b9a9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 10784 bytes
font_01_sfnt_off00013911.bin
ee2a3244d165642b3a020e54d66e93c2758f825c17ca3c8a78beb1401a2411bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x13911 18248 bytes
font_02_sfnt_off0001689b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1689B 16792 bytes