Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7f11832cc5b4ec…

MALICIOUS

PDF

81.5 KB Created: 2021-08-24 05:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fe0f8fd30572b5dae7d4ff300c1a1290 SHA-1: 4f4b5561603822374de935eb60b17b72a29648ab SHA-256: 0b7f11832cc5b4ecf7e12b30dcd45223b1071a520ab9fffc88aa00d41caa8b99
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting domains. While no scripts were explicitly extracted, the presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary purpose is to lure users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/f6e3varfh74vtq930dg5mvkkop/30263497982.pdf In PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608db7074f079---36865681624.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/eeba2ae317e1ce52e7a00620ade6067c/xogodafavofopuwufa.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bda1cbf43---43827493706.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/92137316719.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/lobafulir.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/gusanefomugezimeviluzazu.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/wexopulapir.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hpdna5pqc49r9b466fv98eulpd/sawakezofidedorolujare.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202107file/2021070717333870554.pdfIn PDF document text
    • https://vestol.bg/files/file/pevew.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/rrknggn55c7215itjedoek60os/83014550073.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161236996aa430---pejofivagodugodomekipi.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/52090064974.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160893c9b54083---dozifemaze.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/disuledotisubudiro.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/55647766801.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/00823c28c3a92fe2af687357450da503/veworipuxavuginibagukefuk.pdfIn PDF document text
    • http://handgun.ee/media/file/wokawi.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/50185405458.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/svj2k3p0selbm1aeovab907rm2/fowofovarogeponidifujid.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/wetapasasakijovizuzawelib.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae6b6239bd---wulexufuloxida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=1+month+miscarriage+looks+likePDF 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_off0000dc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 16908 bytes
SHA-256: 72e7b2143a7552601cfe585e820f145eb39f5dbc8a06e467ab290668df54fd4d
font_01_sfnt_off000107e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E0 10724 bytes
SHA-256: 79209f00dc10aa5a37c8317bfde62f17b625f864571aa183a2d82de34137873d
font_02_sfnt_off00012054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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