Malicious PDF — malware analysis report

Static analysis result for SHA-256 e827dca9535fdc23…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 05:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 895c123bff14779db8e809dc0de18d0f SHA-1: a501c4d345dd8e5f19a940e91d69467e3bea789e SHA-256: e827dca9535fdc2349e388775d857f318781853006aa61f8acca8d076bced54c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=the+shape+of+a+prism PDF link annotation
    • http://argol-editions.fr/userfiles/file/gigorujimuboweder.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/vipusawexomipef.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/8350817726.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142026d001bf---97518002096.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/59874526231.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/laruxetosowanet.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/28600029363.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/83440575561.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/74231977655.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/94861278763.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/019f6371abefb2111480e7f91540bab8/dafivinufifuwutowi.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/kipotafuda.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/96091433117.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/jolup.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/17891973008.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/19985171916.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f650c2e51---lopiboxok.pdfIn PDF document text
    • http://dgjst.com/upfile/file/vewutasajitewikaf.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614912653905d---41019323456.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1a633bc3e---54252476268.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/gagalok.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/fomalakagokuliru.pdfIn PDF document text
    • https://10fci.org/userfiles/file/bumisegometowozozu.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/51564427642.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/bd3d680400cd74fc07a3448ee89683fe/viwitaluwisewege.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_off0000b4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCC 10336 bytes
SHA-256: 516e1637e341649b350019d7de8906e3917ba8a5a4ac8fdebed0f65b80c29c1d
font_02_sfnt_off0000e41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 16088 bytes
SHA-256: 1f4e822f5a8f2cb2eb17569a9f6415fcf058596ba6241148cd0db78e94b8116d

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