Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7df03673478cddc…

MALICIOUS

PDF

84.4 KB Created: 2021-07-02 08:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 427749623f7dc4edfca9b20144539ecc SHA-1: abb7cecf7b0b8628a45bd5e5813342aebd08c313 SHA-256: a7df03673478cddc3186259b10a6f3153171927a4fdc33998e01f1fd41910313
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many distinct hosts, suggesting it's designed to redirect users to potentially harmful websites. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL patterns point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/c7239af5ab2afeb8915684ffb0c94c33/mojononuf.pdf In PDF document text
    • https://sunarchegypt.com/userfiles/file/xuzilovegipowakefuvukenu.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a79eb066e9c---31301037353.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/b950b94c18aa51a6c5c53428751265c1/75400411537.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/pekepu.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/jphhlthcjlm15ni1jsjvd58o2g/10632474958.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/38187268889.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c49376cba---baxebizukewuloxi.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bc6f85033---detarelarimukerokoveru.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/45509858129.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/xuxudelutonem.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a76515c6514---24278848537.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/l90j854nroda0dia09i3o1sql0/wijarugajewilatimumuz.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c22d535403---7126096479.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a1908823---99399129721.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/27558098671.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/2ca9be2eb254be4f35a757850bd0bc08/lobanivufaze.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/47005387459.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ineh0kb9pu7q0h80c5bs5vp7p6/loxofaxomojone.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/hema5neirlnnsb1iq83efmnbt7/58962979885.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/ruvurejasiromidukoju.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/57442972509.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/46584446039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=hipaa+and+privacy+act+training+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_off0000e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 17700 bytes
SHA-256: 7a83504aa2b4c75303498a296a97d086ef0b337ebb3827a651f09db53c6a937a
font_01_sfnt_off00011193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AA 10780 bytes
SHA-256: 006be9bd5863f58f80d944594c6d5cc5963a8a6782cd8bb33dfe5895e7de16cf