Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68abca0b24e1ab2…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 06:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6dd6b076d5768fbdb7965514fb0bdddf SHA-1: 7f7d04e182a970d07b41b5e66a661305ea054cb5 SHA-256: f68abca0b24e1ab2b36b427676885b43e58d67f8c6a458e1c44665369312481c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be disposable or compromised, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure itself is designed to redirect users to potentially harmful content.

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://vinhomeshaiphong.net/app/webroot/img/files/bejubuw.pdf In PDF document text
    • http://barexkft.hu/userfiles/file/33292356375.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/biloki.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/2892406362.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/5918250176.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/wosekuwusuwiv.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/86847833773.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/31070954286.pdfIn PDF document text
    • https://www.alliance-educationsexuelle.ch/ck/ckfinder/userfiles/files/14942302728.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/sugiturok.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/rewukamipabuwikovamogodu.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/7535262927.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/99108174211.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/43853145868.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f534b4930f9c7ba9852571c1179a638d/valiruzesazakutimivikop.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/12954524033.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/41605091867.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/89184143773.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/folikoviliruwirim.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/babapurutoledubigarijudas.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486ab01346b---nasedikofogejurofigamuji.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139060998893---nezidarabaf.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75150123442.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/08/37417024660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=fgn+air+parcel+trackingPDF 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_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 18788 bytes
SHA-256: d6aa831a41580521e09c2d1bc0de25c99edbf236bc2f12b6db269261c68b0312
font_01_sfnt_off00010c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C95 10332 bytes
SHA-256: 426d4a405061b8ea5bf96bbe913206f606c0832f791a0f792afa306685f4c130
font_02_sfnt_off00012400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1