Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4936e93e25d953f…

MALICIOUS

PDF

69.8 KB Created: 2021-09-29 14:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e5429b1c7a609e8e4a62c3e6b2d0d43 SHA-1: 7b74193efc896f03ed2d35d1474561ca0fb8070e SHA-256: f4936e93e25d953f8cbf1e48cea808b09c1e7848305ce0a92906c49f573031f9
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's purpose is to serve as a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://archism.ru/uplcv?utm_term=dragon+ball+z+kai+the+final+chapters+episodes
    • http://snsi.jp/image/news_file/92875169243.pdf
    • http://edu-soft.ru/site/htmlimages/file/16987433196.pdf
    • http://heatexchangersolution.com/upload_fck/file/2021-9-16/20210916050731523131.pdf
    • http://uzmansporzeminkaplama.com/resimler/files/tojelisibovev.pdf
    • https://istruttorecinofilo.it/userfiles/file/86769085306.pdf
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/faxavavotubevuju.pdf
    • http://cmtdental.com/upload/ckimg/files/lezidisavowadivegap.pdf
    • https://goooinggroup.com/userfiles/files/20210922_062202.pdf
    • https://altinhediyeler.com/calisma2/files/uploads/zuxadonoxemotuzez.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb3c7f4208---31191314404.pdf
    • http://bjerkelunden.org/content/files/userfiles/file///41594222268.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161541668a50a0---81258132291.pdf
    • https://baptistfriends.org/media/24273777023.pdf
    • https://tlkingatlan.hu/kepek/other/file/13740012842.pdf
    • http://vincentianssjp.com/userfiles/file/9337730805.pdf
    • https://svltv.in/userfiles/files/39398405490.pdf
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/zatelom.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fc11a12f7---tuwosexenazuramu.pdf
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/nepezulalimibalefusow.pdf
    • http://dienlanhhuubinh.com/upload/files/94165814977.pdf
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/40454486530.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161474b51b253b---fenisoso.pdf
    • https://minhvuongthuphap.com/upload/ck/files/zogopotivometamisawu.pdf
    • https://superpackeg.com/userfiles/file/xuxagowojazo.pdf
    • https://aimhc.com/userfiles/file/rewukawenasokewetubuf.pdf
    • http://studioaeditecne.it/userfiles/file/34292341094.pdf
    • https://biholka.cz/uploades/userfiles/file/81114381110.pdf
    • http://mnwebdesign.dk/userfiles/file/24455069903.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_off0000b3c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C2 16792 bytes
font_01_sfnt_off0000cbd9.bin
c35294df6220a2641ab5014acd545989933f3a3213c37e9239af46fcbb7a1382
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD9 11192 bytes
font_02_sfnt_off0000e593.bin
cc5f5e00c7b83fb9c4a6a20b2761c903fa9ea579170571f27056cd333f8ffbde
pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 14256 bytes