Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ad6524a1cbe30c…

MALICIOUS

PDF

74.0 KB Created: 2021-09-03 07:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a36dfdfc4d1360d2c5c9853e41ea8a2b SHA-1: 096fc1a9e57aa5103faec909f784e73c3520a32d SHA-256: b3ad6524a1cbe30c30db18a9e3c5d86efc7f73688f1d6eb70428ba378b4d5fac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs pointing to potentially compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document's purpose appears to be directing users to a large number of external URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 http://amon-syotengai.com/userfiles/file/60829344667.pdf In PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/2cfed9c6583374aef197bacf2736a298/rawoxilaf.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/96971863362.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/xivutuvekezo.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/pufumegetazidela.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160aaba50e729d---32348469585.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/jbklc1h9cpr6mf7t1amletb9a1/94264642869.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/32832732762.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05ef326d8a---60534910106.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/16783394745.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/613ef29d63d4af364fd6d20637eb4b33/nozedodekuxelepanus.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094316b32ead---84978638783.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608589e80bc55---tixowujijanugikopoj.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612b35dd12813---49980195969.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/cb9c18346f7e90d5b4c7237562521a39/10086763470.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b613283110---66532695920.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/mupimepoferuve.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/g8pul94i1gl5tb7qbkv9avfjku/davojow.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d8228446487---6718778416.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/furenuzega.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36230971262.pdfIn PDF document text
    • http://alkanboya.com/files/file///tibazusilija.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/pevoliwivatidab.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/71f45268eb742342e2bea15dfc6fbc5c/2251375174.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b15c2a0fb---32339925139.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///2021771454291254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=geriatric+mental+status+examination+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_off0000bfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC3 11020 bytes
SHA-256: dad2a8a4a79b6ed55f7d2332dc07027174459d76f8ff7f8d78f5ccecd2a4219f
font_01_sfnt_off0000d96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96E 15612 bytes
SHA-256: e3819d4abe15770c8926c340d205d777fef037d378208155c341e467273e808d
font_02_sfnt_off00010151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1