Malicious PDF — malware analysis report

Static analysis result for SHA-256 66efc360b3f3a5db…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 00:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cf198957d94b986fb141c312a58decb7 SHA-1: c8774fde6555a7f00fb7e1e743f718bf89ceb182 SHA-256: 66efc360b3f3a5db9da9bbb0461741371f913804cf081497d1254bcf1d989cb1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL findings point to a common pattern of using malicious PDFs to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smidgel.ru/uplcv?utm_term=ios+font+on+android PDF link annotation
    • https://blueparadise.pl/userfiles/file/gewegemude.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/dept54sfagq9asotiv6tgncc73/35887975909.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/57353437831.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/78809281947.pdfIn PDF document text
    • http://erpos.sk/data/files/93561593589.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/nopugakojeriwoxup.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/476236782a8326bcafe00ec7759456e0.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/11979ba22fbf38b9b69aa544cf692e14/jujojalelol.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-06/images/files/72259001438.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d6f8e044---52860766987.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/20513434408.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/35257309065.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/parabirupisamujakagipala.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/11825077592.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/lisixojawifawuz.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76155899218.pdfIn PDF document text
    • http://tayles.com/uploaded/55698511216.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/2549404443.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138b94d7e206---fuveritonogit.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/21591175210.pdfIn PDF document text
    • https://euchebnici.com/img/file/setanabodek.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/tovujawudepokuvifogisod.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/xasatowulesuworajazefa.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/54148005262.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_off0000da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 10120 bytes
SHA-256: 98d7fe1f7e640de4222cf039f49e790faaeb6cb1c080872b901a3098df6c6599
font_01_sfnt_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 19992 bytes
SHA-256: 15b71bd78cdce075684efbedb86422f18133ddad0c4057ae8077c5341e45ed3c
font_02_sfnt_off000125a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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