Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe52567ebad6afb…

MALICIOUS

PDF

86.8 KB Created: 2021-09-16 21:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e0d3220c55d192fbe0087a1689df482a SHA-1: 8d4c1980cd64d439dba4bfe8047f618e5e2a28b2 SHA-256: 5fe52567ebad6afb8ba2a7f25bc5205d438ebf879ce7da7d61a402d6f7da5ddc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/uplcv?utm_term=book+my+show+app+download+apk PDF link annotation
    • http://droneducational.com/admin/userfiles/file/13025647260.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/vujokafunevunofimezademaf.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/febalasageden.pdfIn PDF document text
    • http://cga82.com/admin/File/8632614138.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161302d52888d3---pexivesumezimedawu.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/nejixalin.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/eb70cff0098e9545c77a2d15b5ba4de3/16305685817.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/baccd263fc90b7dd1fa987a987f21ca4/85379536620.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/wolaji.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/1906437743.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/84395081890.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/46721351867.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/tanasaxi.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/zuvav.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/31971312277.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021961420376176.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/bezinezoti.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/virutogusatumukalufegig.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/kepej.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/diger.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/45275805666.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/34329334680.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/32543394689.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/59546157204.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/menoguzunedomazexe.pdfIn PDF document text
    • 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_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001053b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 10580 bytes
SHA-256: 72f6f869c97dcb7e418aa52a05c5f20a85265ed6e1d19b9e856541e29c808717
font_02_sfnt_off00011d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D45 18284 bytes
SHA-256: f63c9fa7d68530f7a5b17f9399b7d3745ed342319016b844ded28436f7908a9d