Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4d682d4f3724f0…

MALICIOUS

PDF

94.9 KB Created: 2021-08-21 21:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0a93f96d02d535584eb447aead9f1f3f SHA-1: 07eed993e38588b80cee7eeb571bf91857b65a7f SHA-256: 7f4d682d4f3724f0c285bedc3bb9840ef59c64e357f6723b24834e182d710625
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites and disposable hosting, a common tactic for distributing malicious payloads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method used to evade static analysis. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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=descargar+daemon+tools+full+2019+mega PDF link annotation
    • http://abnicum.ru/files/file/19621189752.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/381c63a2135f592f27c11c48e321cf48/39686540667.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/d3fb989111191c87a0e3093c9547156e/sazibabozupara.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/11087255567.pdfIn PDF document text
    • http://apsons.eu/files/file/jadawogo.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/vamuxezekamida.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/72229564515.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/c19bb55cf02d46fd43b5e3df679d2566/lilaji.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/remewowupaxupaxi.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/35b36f06f2ca9948d50aaadf14a5d1cc/20308833100.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/p1ngbj79oarb6213ue353dsv9k/bepexonusa.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/53970810250.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abdff955d20---wuwetekegixefus.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/f9btgc553jv62vpbdnr7aqdlft/vomokulaza.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/2283643683.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/19837318020.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/n4qcgm9pg5bes05tdejtac6oo3/ludifixadelobadirisikuzo.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/8777a0d1e51558eeaab65c9e89fd7f94/pekifuzeve.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/tikuxotavin.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/vejavoposiwoxuliwuzatori.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/lpcivi4k3ab7jt1umjo0q7ipc0/zenuvofegedoledabawe.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/ruvojarekakarofe.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/jifizo.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CA 11288 bytes
SHA-256: b458a25af45592e815238162fe67d141d8e17bad5de677f8e522071be1afd590
font_01_sfnt_off0000fe3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 2912 bytes
SHA-256: 3288ef66e2079d1d9432929940394612735827f7dd9494b1984c6aaad6269dca
font_02_sfnt_off00010a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0C 19964 bytes
SHA-256: 0299233aa5c7eb3ae3f3c47e550829cc2001b77913e28fe46c70a00c467675c2
font_03_sfnt_off00013c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6D 16420 bytes
SHA-256: ec3ffd68be9817c6ee76615224447d49ea7fc6e1f3894b34fb3c65f48b0b1c00
font_04_sfnt_off0001530b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1530B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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