Malicious PDF — malware analysis report

Static analysis result for SHA-256 157813298b53b4ea…

MALICIOUS

PDF

75.1 KB Created: 2021-09-08 14:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45460c83e86578165566fc62ef91bc0b SHA-1: a41eb4f79b5c0aa004c68b597ac46fdcfce8dcc6 SHA-256: 157813298b53b4ea64312ed72dd65d574e859ebdc35f3850ee9599d1c012a68e
164 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting it's designed to lead users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure for link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://abwlanham.com/uploads/files/wepaxu.pdf In PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/00d581d8ee21d1468ca77b1191cbf121/23982370470.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/sudejamije.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e19feed33---gedukiki.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613504823cd4d---60377722130.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/8651549650.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/47990924802.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jonuruvaxobezamizud.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/91525655792.pdfIn PDF document text
    • http://lizhechem.com/upload/files/84934002735.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613627f8dfd87---35931805771.pdfIn PDF document text
    • http://cocoal.com/uploads/file/74776912418.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/22632573141.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/kivadepira.pdfIn PDF document text
    • https://euchebnici.com/img/file/setanabodek.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/mezevuvofimufutusazuko.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/81745700929.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/pofazuk.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/16200008251.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/zajokidukozovorawuz.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/99326703910.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613767eb30ce4---28741766009.pdfIn PDF document text
    • https://dcimx.com/files/17492249492.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/48612188889.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/91520137696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+secret+law+of+attraction+book+in+urdu+pdfPDF 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_off0000c12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD944 11096 bytes
SHA-256: 77b610c5f19e00640beb1e867455ea3f1d7a716300340a1736b5364ee957d40d
font_02_sfnt_off0000f2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 16864 bytes
SHA-256: b66d9b2eac7daf11f93254c5d512d2268b4b2777a246cdff6cfa7e3ddc1274f3