Malicious PDF — malware analysis report

Static analysis result for SHA-256 291ff5dd921c44af…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 04:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 57f2ef5a379c707b00216e4a015e8248 SHA-1: 8b707c1ee7dd6de046b20c75a8a188165bcb0d22 SHA-256: 291ff5dd921c44af76e871860a2c32f6eaed388a20c32826def0335eb1167ce0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://krisoc.ru/uplcv?utm_term=redmi+note+5a+stuck+recovery+mode PDF link annotation
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/tevatamibitifafu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613780f654bd3---16432739258.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/78983796128.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fca57610c4---61772612763.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/4712204450.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/zevumumazobetup.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/kilesulu.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/92271688738.pdfIn PDF document text
    • http://dmkert.hu/files/file/82268135247.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/buvapexizikanugexila.pdfIn PDF document text
    • http://zzquansu.cn/d/files/389321122.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/69484220763.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/zesewubabajoritixedib.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/48972366396.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5955b5a40---sesuxamilepul.pdfIn PDF document text
    • http://moretonassets.net/userfiles/fatimobidukixa.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161343480b63c9---83412618490.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/rakofu.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/puletoj.pdfIn PDF document text
    • http://manu-transport.com/documents/file/repuvafarariwivozatil.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_off0000d47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47F 11036 bytes
SHA-256: 585d24296b1ac67cd347aa55cba1abf9e07c45429f77a6ac80db0aecae1e0de4
font_01_sfnt_off0000ee49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE49 20816 bytes
SHA-256: 5289b22ceb0a4156208b5e458f1f288d08b23aadf1652691c3862e4dbd9385ba
font_02_sfnt_off00012485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1