Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ee1b91ddfb6f1e…

MALICIOUS

PDF

89.9 KB Created: 2021-08-11 20:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8af266c2bf5abb3930f78b0d1b250036 SHA-1: 75ed61db8bc41958b49fe1056dab3801450e8c00 SHA-256: b5ee1b91ddfb6f1edbd312b550329900911ec263bc7b12fa7e81634fffec7494
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised or disposable infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure of downloading a file, which could be a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/bomus.pdf In PDF document text
    • http://savannahcentury.info/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/ketogirikabenufotajipek.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/0814e812ef239d6ea7638bb5f01d51e8/52184548452.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca92d70e83---32947963208.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/ridolaferuxetuvotimusemo.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/90207028925.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/zekikunipifopekoxumip.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021052518355873499.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/17957280859.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/ditototamevopozew.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/mekoxomimixibajemipewew.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/72391245914.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/3q9qlj8t158c787q68v3rnjcm0/kovoxuxanikoxe.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff08cdce5f---65385682029.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/64378598292.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/14594487829.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/a86f0673449aa157019193e62bbe833f/2996935253.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c851533eb97---19061509925.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/rnk8a019kr37qu641kjut1s6li/88972560678.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/45113562232.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/54836487281.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/69d5473dbb82c6ff6b4df13cb2c52986/dugodosofelarigotezorij.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/jofafapadije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=driverpack+solution+offline+download+for+pc+windows+10+64+bitPDF link annotation
    • 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_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 17312 bytes
SHA-256: 6ed54ebaebfe14f5c7568dffb8127e9584c34d61147ad9eb1bb282545d0ed722
font_01_sfnt_off00012524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12524 11516 bytes
SHA-256: 8f16ae699848da23f66bedaba856afe9bb06e8c23b7497ea8a4c70844205bf6e
font_02_sfnt_off00014084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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