Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ea73030ee98d91…

MALICIOUS

PDF

87.0 KB Created: 2021-09-02 18:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a955cc6c139b4b3aa80c2baea676ea6 SHA-1: e110e3d8b23b07af687578c52541d9405eda4836 SHA-256: 99ea73030ee98d917d8037e89e8758ced295e2bd2ebaa7c5fe6cb8824b057df7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains a link farm pointing to compromised WordPress sites, suggesting it's designed to trick users into downloading further malicious content. The presence of multiple PDF URIs and a download button lure reinforces this phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/535eaa18693fc68a52ac74bbe29680e1/83280708673.pdf In PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/d823efbcdd6c847da2009394fa19ba94/66505654614.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/6179u37uiddje65084j5edfrk5/25326433854.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb03b45555---kegelipinuliboj.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/51949639245.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/6ccdebb147172dfc98b41609dfec88f0/60131683757.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160835d60693b8---45901029073.pdfPDF link annotation
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0822/df76b7ddc24e5de402359418b6585a68.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d994e75486---34588640277.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5358bd65a---razumofujifis.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903aa4c3499---34221487787.pdfIn PDF document text
    • https://cityface.cz/res/file/6929981704.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/c60b31381e034d6698b2f2f0d3f3c664/vetikimewazetekinexemate.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/987726478982cdfb5cd3a2863fb4fcc0/wafiwuna.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/11203556140.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/fbc206098033a7225c9f94893cc1f976/soxizabajedode.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/47501259045.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f213fdc7e7---6202448352.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cbb070afb---fowegowelesopafeleb.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/61978095134.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/solabafabol.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/31fdcd3354b77457e2876a7bac618cd1/modibaxajabenalilaja.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46890d3b72---xabupofozitanixamisoxuvex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=forms+of+government+worksheet+answersPDF 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_off0000f006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 17740 bytes
SHA-256: 24673923ab51b8ed9b295c5a34f9ee1f1cee83936547e0a1eadcd57061bf0c71
font_02_sfnt_off0001356f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356F 10744 bytes
SHA-256: feb84c5de719c61434d9e05f7c3b847184893573315a70ce3357a5ff05b9925b

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