Malicious PDF — malware analysis report

Static analysis result for SHA-256 8834f7a0dbdf2366…

MALICIOUS

PDF

69.0 KB Created: 2021-09-14 02:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 86ddbe0ff3d6b1041bd582cd69299979 SHA-1: acbb2b64859d128b62cdba0f2200090883691487 SHA-256: 8834f7a0dbdf23662ec146328b82c65a5c2b8477cfd6f32027920d71a40ab034
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://prompol.com/media/file/vulupikujariwug.pdf In PDF document text
    • http://heizler.hu/files/file/foseribom.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/28371706277.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/sawotedeva.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/4047028764.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/86382928911.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/35574778264.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/23632574540.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6c2928cf6---gupokanuj.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2c5b9bd71---julazubaliravake.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/jowikebe.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/95343848588.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210911165452_1797873020.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/zejesigizo.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/nemapikinavinanuvizix.pdfIn PDF document text
    • http://annabarons.lv/files/files/setal.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/risalodufalivowapopavi.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d046d925b4a7a985586fefcde2671e41/xobekodumivumukijapu.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/kavinafafixugosomusigus.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/pemufidodiji.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/rotapal.pdfIn PDF document text
    • http://apvn.info/userfiles/file/7418660476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+secret+dare+to+dream+watch+online+123moviesPDF 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_off0000ae75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE75 11092 bytes
SHA-256: 545a700885b3e8f5cc34d28bc5caf6acac6864e9fb5de87a64236803b5275601
font_01_sfnt_off0000c858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06A 15136 bytes
SHA-256: c54c382b26d0ff2121f347468ae80f0a43d4cab8aa66e8d5cc0e18f4f0dfe30c