Malicious PDF — malware analysis report

Static analysis result for SHA-256 43cdd5c99aae26b6…

MALICIOUS

PDF

75.1 KB Created: 2021-09-16 05:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e6a0395921914443835a83d2f00e5f96 SHA-1: 4894bea6de37c587134fb8c8b4ae749a66e49ea0 SHA-256: 43cdd5c99aae26b63a34a29d7d2dcc877b2b43244b67c1d8245feaf2db2a56dd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=words+that+start+with+double+e PDF link annotation
    • https://mytekas.com/UserFiles/file/12622902308.pdfIn PDF document text
    • http://pasted-radio.de/web/files/28683907089.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/kufiwepujejutazavaxunof.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/15485786577.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/9025248131.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/tojagigepakibenaf.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/83939589474.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/77352620560.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/fazepinajakup.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cc8e2735f082de83a433ab6b121d5edd/zejiripepowinokowafu.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/74311892260.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/nepivulo.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/78110205881.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/31697152720.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/48518658630.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/fefapusebozu.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/10355770196.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/2666813135.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/93810388941.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/59672279857.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/sonazafize.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec01d8a7e5---27742418783.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b557b2f58---pofijunurulenakitovapisan.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_off0000c064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC064 17944 bytes
SHA-256: 87f06adcec01b1f961cf730b9ac3328609b544e7293fa33d11b0196a81292c78
font_01_sfnt_off0000ee34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE34 10560 bytes
SHA-256: cb1c07d117ddb2103382d6344c7cd1681d8515652c8c8adec2a4d7c9de2347cb
font_02_sfnt_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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