Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc093061f52456a…

MALICIOUS

PDF

75.1 KB Created: 2021-09-08 11:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c7108c40d79037f99ba1b54896f9da82 SHA-1: be02cab66f2c0b8123188bcc464c06b4aa2957d4 SHA-256: dfc093061f52456aa2af23d4ca2c1536890ac6c9795c417d30367e4c5c601d84
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, 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 patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hostsolutions.ro/app/webroot/files/userfiles/files/94824084814.pdf In PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16093d52620e21---92646596525.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/jokebaganiz.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/2579769269.pdfIn PDF document text
    • http://eksternest.be/images/file/nanigivesaf.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/62748963657.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/78942868943.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/gotilufuwigad.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/32983935507.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/nrn5hgva8egja9qloghp4uitl2/lazeborukefawaleri.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/97662044447.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/s09vkunvtqcis7qt0efd227421/kesevarajanalez.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608567f9351e1---damojixijaw.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b065bb8ead3---74373757178.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/tidubabal.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/l2uo65tl2aqkqmm4b28dn61u3c/79849945850.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/kujari.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/nokosidirenenilufupi.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdeca6d4375---sivawazizirotativemizufar.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/18122011285.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa05878d78---51201858374.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/lukasanonodof.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/vazafaxutagawipe.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/25668262018.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/genokibepofonigawizir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=2004+dodge+durango+parts+manualPDF 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_off0000c1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B4 17176 bytes
SHA-256: 1af41a183b9b1e7a6adcb40a1d551ddb03a9d5fd4d63b9154eeab301dcd86b5d
font_01_sfnt_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DA 10968 bytes
SHA-256: 2193c09d5d82035adb864f3685ead1b3d132b29869d3c6c87bd1deefd622e10a