Malicious PDF — malware analysis report

Static analysis result for SHA-256 b032ab4f18dadc3a…

MALICIOUS

PDF

84.8 KB Created: 2021-08-21 03:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 88743a71ea604bddaf3bb57bd8603a07 SHA-1: e139899e6907e0ef3f56d37926960662b78a7f66 SHA-256: b032ab4f18dadc3ade56ced197f40a7ff1439f92e8b4d36271e9ffca5f3f42f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/bebe44ad24c0924b5a784156f153eb1a/xojapixofexupuke.pdf In PDF document text
    • https://digireg.at/upload/puvidemelaluronawokobi.pdfIn PDF document text
    • http://metapolar.hu/tmp/36495329428.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/50327935010.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/25860266121.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d62d98a47ea---derawowigopenarex.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/fobujiterejusevigudelofin.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/tl4m1bmmscjv5j445rbjocibd4/bajosi.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/f3343df24f302bdaabeddf0e3ab4e8d1/71122728033.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/83149940560f85d3fc91a6.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/mudixija.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/kezetogus.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e12e873126e---88497588969.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/9a222c2de77ccfea60fa758c40c8a796/413644469.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/berujijex.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/48633963112.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/zaxawuwinus.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/neropinulerivikawopod.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/60212360778.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/t5d318bt9pj80rovrvn5eek4jo/97765105442.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160716e7a2cdb3---50099816515.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22aa10f0e2---29290799437.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/defif.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/runarajenagef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=honda+accord+euro+workshop+manual+pdfPDF 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_off0000e6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 10964 bytes
SHA-256: d28d8435819137b961eded8626f6d6a06ef0f0cf05a8e42fc545dd4b4b2c352b
font_01_sfnt_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 16808 bytes
SHA-256: fef621df179577d36c9f73b59f08f0768f795a170291c7692d7d79012a6e7bb9
font_02_sfnt_off00012be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1