Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efdf6ce468575a7…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 03:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3bd0afe0646f509335b2b11e65c2818 SHA-1: ba49e6cc26a9b705fed45f41afc7b4045c4d4770 SHA-256: 6efdf6ce468575a72f8416f3e1ee7442e460e8fe30376ae9a3e38fd955c0fa01
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://crysiq.ru/uplcv?utm_term=free+esl+comprehension+worksheets PDF link annotation
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160867f84bf202---99880303364.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/vajitifafuvupagik.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/bobobi.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/nevak.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/16fbb728f41768fc2edb7bc7da2756a2/80913632358.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/eg41s32pmogntao9fc6safuhss/41958038927.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/65490356791.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/togulujavutiramimesuse.pdfIn PDF document text
    • http://samtekelektrik.com/files/76368195385.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e2c83449f0708ca61b3cb8a6052c551b/25008560062.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47439bc2dd---1409364816.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/51114248389.pdfIn PDF document text
    • https://xn--8--clcp3bi.xn--p1ai/files/59289368992.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16074190e2bf62---nevajosaxozuragus.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/93530504809.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7714f870bf---vixupobu.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/09b696ec4d357b0d62e3912cb5435a27/sofogasetemoliwo.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/f239e423e19c50f35384e5e548defd4d/ripunogorudunopijev.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/86172987591.pdfIn PDF document text
    • http://hanleyresources.com/images/kajonodusi.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/fizakexojavetamexulukul.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/71777295413.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/bexiz.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/gepetijaxarovimadukedoje.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_off0000d649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD649 10632 bytes
SHA-256: ebb61da453dac99ca0887ab3fbce42a2a6db7e79fc128d8472e682f6d4ebbdc1
font_01_sfnt_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 18156 bytes
SHA-256: 193ab367604081059c3e16ea0a3df7a21ae2c2108c25c92a7aa7e5ddfdb98afb
font_02_sfnt_off00011cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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