Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04c20d6780c440f…

MALICIOUS

PDF

70.7 KB Created: 2021-09-03 00:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: cc7e0ffa3acd9e9231c48c3cac65add2 SHA-1: 0d0b032d3a4bc9bd7e218e6677d53068176d21a2 SHA-256: c04c20d6780c440fe0e1a0c5748ebd9d3c1094e046c6fad6f7b7f5f36b5f3568
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7970

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=calendario+2018+con+semanas+pdf PDF link annotation
    • https://ferest.ro/imagini_ws/zetekomomokidukaruretu.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/biburemaj.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c5014c6778b4501672bcb5990d6ef85e/wiwumijanoxiwitonebepoke.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086aacd624c1---51206249609.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021071718001070554.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//62163508782.pdfIn PDF document text
    • https://samowar.ch/upload/file/25519457952.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/882d7e5ca35d2a681828bbf8d9360021/sopatutudukinenexofin.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/66382626489.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/20761059990.pdfIn PDF document text
    • http://mousike.it/img_ins/files/92261100647.pdfIn PDF document text
    • http://altinay-law.com/images/file/lebidutu.pdfIn PDF document text
    • https://aedwea.com/upload/foto/74588352187.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/defisuzabizevisipix.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/368b66d5837da9b51b4ba38abfc20a6c/jesetidugulakobedazazufu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca74ef9e78f---pesoso.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/53080713320.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccf0022ad5---lozefasovowejubejeropakob.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2ca9e2418---wizatipalimavizazom.pdfIn PDF document text
    • http://fkhd.cz/data/img/kebawepumutiwinadegadifer.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/13874860595.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/15486781843.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e8aac80f8---39258372513.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/tesosi.pdfIn PDF document text
    • http://demkapi.com/resimler/files/44785879443.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A5 16200 bytes
SHA-256: c8ac213104cd4fe7d515075e2c4730bd4f2a0de62042785650a011944376269a
font_01_sfnt_off0000e293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 11216 bytes
SHA-256: af1590f094397006e4b6b8ea6bdff7115cfac3733e446b4ce9b3dad9c8dcdb58

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