Malicious PDF — malware analysis report

Static analysis result for SHA-256 4755c96a46672342…

MALICIOUS

PDF

73.6 KB Created: 2021-09-11 13:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c108502f02b7d88a20012d4b466793b4 SHA-1: 102386325b0621137a692d8ba25074e64fe32352 SHA-256: 4755c96a4667234292c63189ba68db89b42d8fbdb9121342aefc3fa9d3ae3256
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm used for redirection. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures or malware droppers.

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://bazab.ru/ckfinder/userfiles/files/fizusidivesasotidamupu.pdf In PDF document text
    • https://karpataljaturizmus.hu/upload/17264575642.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109011818066285.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/772a313698f71e4ac7165dc0bab9c882/posusatigubelirokinumali.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/91669369638.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/tadaxur.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fce2130999---93673684971.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/gavodivefitugajizinulujoj.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/zaluwuzejipojutu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a65fa03590---34568640912.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/61356032076.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d90c72a3---64778599523.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/ab4f49cb78cba124439bfeb1a339837e/43250450700.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/wenejad.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/66784701355.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///jogasitonufisenuxeg.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/sipira.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c1f0a58eb---litazojivifara.pdfIn PDF document text
    • http://cx-gl.hu/images/files/71782567972.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/95939977412.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/repamupevexajaluk.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/648f3ec4422912a2ce6cd5cd1e637a37/dukomomowanogegubovoso.pdfIn PDF document text
    • https://latework.cz/soubory/ponojojon.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/53439365307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=full+movies+online+free+sitesPDF link annotation
    • 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_off0000bfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE1 16156 bytes
SHA-256: a3cf2cc8718fb52b7a8bd20a7e5eb7db36bfbc493ac9c69e039941c0d208ef22
font_01_sfnt_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 10356 bytes
SHA-256: b69c5850dfc3c820db2bea1aeef404d258d01519e00c3364768dbf6db7b9eaf6
font_02_sfnt_off00010091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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