Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc175e997dd12f7…

MALICIOUS

PDF

99.3 KB Created: 2021-09-07 00:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 997b3bc8c008161738c2e443a8e2f37e SHA-1: 653f08db1be327d16a1f5c8c4fac004b51ebd20b SHA-256: ffc175e997dd12f710a7f9adb44295a842f36e741e0902d5e174b5b29e456132
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL patterns are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd657067ae---xeniwibipudobotew.pdf In PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16105874e42eff---46551293457.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/ronezikut.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/72110781336.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/d8fba89836d431905c300e7f6686e82b/liparujawuki.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/fb84ed16d36c57b21bd18610293b8809/8487201258.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0b44b9d6369b73b29ae5acaeab71d0cf/nigirofebodifekovuva.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/wabisipoluvazatusowefep.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/44284465633.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/tutoladubesij.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/99135363489.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/vuzemivebefopa.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b608c868750---48087311868.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/14164749861.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/nusiwolixelafalilinaguf.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/222aa4558e7c5fd3e331057478e3f957/pizafonaper.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/548b8a1b8e835c3c32ff0061cf9eb2d4/pimezaxulovexidivozijiba.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4aa8b2eea4---zepip.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609231900914c---61955670339.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/lenirapizejenim.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/17328937299.pdfIn PDF document text
    • http://daydala.com/userfiles/file/fitelu.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/haoafnn56ps75ietpbkvpiallq/34955489402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=learn+french+by+podcast+pdfPDF 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_off00011f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F83 10788 bytes
SHA-256: fb78cbfebe77e83c1a1d28c3679a8856a872649e187da9230bf8bca461c9ffe3
font_01_sfnt_off0001381b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001502d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1502D 18328 bytes
SHA-256: 4316cbdf041e05d4d3945f7978e2bd38a73d3f39ba45f1cb68d7ea5752c963d5

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