Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28cc0b9cea4d22e…

MALICIOUS

PDF

86.3 KB Created: 2021-07-05 06:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b09c609d9642764df9d9e370f8531712 SHA-1: bd65cb34844c4fbcf662528487780f7137f49dfe SHA-256: a28cc0b9cea4d22e9c6164442aa7fa6a25ea911af9bd0e28c8bac14b48762250
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to bypass gateway security. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • 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
  • 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://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2dbbd7826---muvefuvonor.pdf
    • https://papiratisk.cz/soubory/62898855272.pdf
    • https://turkihale.com/userfiles/file/gorep.pdf
    • http://aotwresort.net/ckfinder/userfiles/files/21148745923.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa12ed8f8ab---87336272685.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bce1221d968---5928265074.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/cdefb3c6e2ae9a9a39349b50a989780a/venakatinupuwada.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3f9c4924---nebonokeledapekuxumare.pdf
    • http://ncabhsa.com/clients/875427/File/jakotenubalejozexiler.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/e642b2c28b0e4dd94a57ecedb77237d9/mofudotowudemoduxuperid.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab68959d0a3---18695131782.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bc75735503b---bonarikabigevatidijulita.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2adc91985fcef95aec89ca71c26a8c14/zereteveg.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3ajpdlloluvdub6fjbfmbidqt7/25146969482.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb18d5f592---jugokedepewiwada.pdf
    • http://www.toptehnik.si/images/rufegimawegazogixi.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/4a894fe639dff1e28261b870b12e575c/zisofewijuxu.pdf
    • https://soechi.com/userfiles/file/segonibegadawuwage.pdf
    • http://pinxedien.net/upload/files/40793616855.pdf
    • http://hzqzg.com/d/files/pilura.pdf
    • https://ruiguoex.com/upfile/files/2021/06/18/14152416315.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/09cc977058869c19ac4b75571498b5ab/34581421100.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=converting+pdf+to+editable
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f045.bin
da7601121f48a926d2d6f632464eef7658c55779333f0d7220d57540bcd29874
pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 16768 bytes
font_01_sfnt_off00011bc8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC8 16792 bytes
font_02_sfnt_off000133df.bin
95b2e3c452809f41045e72e61fc90fe5bc6701f28b6cbf40b7aae2e75278e4e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x133DF 10740 bytes