Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe28ecfd67a7531b…

MALICIOUS

PDF

76.7 KB Created: 2021-06-30 00:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41a51b5bbb6a79f15e83d77fa9a64b0e SHA-1: 2cec97f0f702b01ed4d8b32ede8e9555b7e8d879 SHA-256: fe28ecfd67a7531b280ac0013970666258e2de2f1e938b0d4a391903d4d5e6b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://garglob.ru/uplcv?utm_term=king+george+va+weather+hourly
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/6b53d4275c2b5049afd681f388bba794/minapoluvejitetizo.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/52e813a3d6366e37e175ad93cbc6296d/jarivudurodakebuzaxiv.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d5760e7ee---54111707467.pdf
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/lomomoxusowedovirosavu.pdf
    • http://www.puhito.hu/uploads/loxodet.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36aa573b7d---53014345488.pdf
    • http://technology-mp.it/userfiles/files/599122455.pdf
    • https://pjkconstruction.ca/images/file/vewagafolesi.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-6-3/20210603150927543141.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/a51b85248bfebf1ad3e03447fc4c2772/toxutuzutinutaxanob.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/68bb81e2f7763da7e9cf59f3bdaef0d5/foxojozotutesen.pdf
    • http://dichvugiayphep.biz/upload/ck/files/88278478112.pdf
    • http://innovatepc.com/userfiles/file/11644568475.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081fcf9a02bb---polifitubili.pdf
    • https://noddy.nu/images/file/93037976754.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1860c03bc9d59ca1c23f3d9ea42ec95c/79754045652.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/1dc97da90d4c532448017fae2c3175ca/bafata.pdf
    • https://aprilboya.com/userfiles/file/6345603633.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160940d112d67a---tajebojupi.pdf
    • http://mamtomchabahai.com/uploads/files/files/57347014396.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fed6c22b13---63266561608.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c6ae6088fa65ada9777d0be400ceb10/jekav.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce46502d63---67991570368.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d3c9500ce7bc33fb85ef424119072c81/54563558541.pdf
    • http://www.malagatour.es/ckfinder/userfiles/files/61265512447.pdf
    • 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_off0000c7aa.bin
da641ca43cc49acfd5a34bf3303d4605699575539d5fde254c52da0111f6fcbd
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AA 10576 bytes
font_01_sfnt_off0000dfc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 16792 bytes
font_02_sfnt_off0000f7d5.bin
907cddc573a9b1ef4b38c90db45ed37bfaac678a236aaabcacb4a7a57f734d79
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D5 17428 bytes