Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76b697ea35d4345…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 19:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2d26763dd581aa52fcba44da11dc9abc SHA-1: ba638b56b577173926ccbd9c160bcb510a9dbee4 SHA-256: f76b697ea35d43452e180e4f2654addaff9da41cf8f6793bfd487256f3f86f15
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it could be used to exploit vulnerabilities or lure users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://oreoltour.ru/sites/default/files/file/32714478644.pdf In PDF document text
    • https://coherence.cz/userfiles/file/57658916872.pdfIn PDF document text
    • https://senfina.top/uploads/files/kosujuxaro.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/57921203719.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/33788382457.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/13989898159.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-2/20210902165336497831.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/nuvekabegeniduvapodar.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/54502782698.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/8cfd09263771ca1f5d8ddff66a928c68/rejigajolexika.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/10ca9737b85c620d878b9303088f0977/89542613082.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/legomujirinuno.pdfIn PDF document text
    • http://gibisch.biz/files/files/xowewunof.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/44669524132.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/75496820516.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/vitugoleroti.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/84115835490.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148585d44e80---38837927369.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/72512096324.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/80203309706.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/sowimitev.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/87263034437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=police+car+stunt+driverPDF link annotation
    • https://easyown.ddproperty.com/datas/files/9432140410.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_off0000b415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB415 10532 bytes
SHA-256: 02336f5291a0893487d1d35a27e31fecadf2ad7648f708f4d761053bfce3c087
font_01_sfnt_off0000cc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC37 18088 bytes
SHA-256: 5f3eb38d7e83c2ac6a7ca3ff2c428461d8dbebe4b82060d8700c1a0d45ce8b6d
font_02_sfnt_off0000fa68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1