Malicious PDF — malware analysis report

Static analysis result for SHA-256 25840c60b1f2c6c3…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 03:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 740c5144ca9368ba345a33e10c3e4ee2 SHA-1: c93b52f6fcaf8ea91740aecb1c8d85d85487dc09 SHA-256: 25840c60b1f2c6c3bbbf8f5d8a2acea6c73d428476c2a56815194d1338c89dac
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or credential harvesting attempt. The critical heuristic 'SE_SECRET_RECOVERY_LURE' strongly indicates the document's intent is to trick users into revealing sensitive information like private keys or backup codes. The embedded JavaScript likely facilitates the phishing mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://huntic.ru/uplcv?utm_term=pdf+to+word+converter+free+mac+download PDF link annotation
    • http://wannawwannie.pl/userfiles/file/magiked.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ijnn8vvh3ro1k03npbie2cdv9m/36113712936.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/dazuxusudakuk.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/4063371748.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/49013726760a0d3d344c1b.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/mimejibusidopusisewo.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/duwewenilotejetinek.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/7eqcfhi9sbgnn3dtti13i2otpf/18252785369.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622894311.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/52441957633.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c35ae6d6c8---64703887440.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/83380376272.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/bonexemuvolimibizuxodewoz.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/nogasagegokiwenu.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/vebalufu.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/kajapavidajukeviwed.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160deec251392f---16586822216.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608203b3f0c94---68384903145.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f078e3fc8a---26881045039.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/merukuzulaga.pdfIn PDF document text
    • http://93564497.com/userfiles/xuvefifewilenetidowara.pdfIn PDF document text
    • http://jerilyndavisrobison.com/clients/870655/File/nonulutizazotixigirusawom.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb4e5d77c5---93097628390.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_off0000d429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD429 10532 bytes
SHA-256: d56f499ac6ee2bb1f5e798927d752b38209bc9f684962be8471e023f7d6734ac
font_01_sfnt_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001044d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044D 17408 bytes
SHA-256: 0f38ee804993cd01e5bae52b583ccd3b6d8ddac0c4e058c220aa749cc546c1ea

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