Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a78c614dda67ae…

MALICIOUS

PDF

85.5 KB Created: 2021-09-04 09:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4c301be854b4c26a0579fec235595f7 SHA-1: edacbd89141eaf109660d99ab453bb4fd822f3ec SHA-256: 61a78c614dda67ae224ea2b2e17ce4f9beee3e82c45b4bdce94c3248df25f603
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://lctrading-gmbh.com/ckfinder/userfiles/files/xadogukufalaxe.pdf In PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/fukosebife.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/91072101185.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b463a2f01e0---ferotarakasipevuwor.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082eefbb7341---vinijobexufonanil.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/woleti.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/40600405054.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/8c8581eaa303dd498178a43219e50f86/polugututusageguwa.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/tifilabosekegas.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8f35621d96033ea9a0010dfcc4a5e482/12793926154.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/dab1bba937899ff68e0ae6497407a884/80115146954.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b977db4e732---puminivevojugefodaperusiz.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/dedidepomibuton.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2596d82983f2b8e5cddaac626c0bddae/16188992751.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/9658081735.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/dapipawisesefuxa.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b18b594ccd---jupilejora.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/tugujos.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/direxamejewemo.pdfIn PDF document text
    • http://immopolignano.lu/images/wetovepipudepujeveboxi.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/84993478747.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/83265519488.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/zumamavonuloso.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/7074454279.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c50e6aa15---66050007682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=garvin%27s+eight+dimensions+of+product+quality+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_off0000e87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87F 17296 bytes
SHA-256: c518dfb3c4b31bb9b7188456a68d8f4ba674a8678c40deae15e21b993d4631b2
font_01_sfnt_off0001152e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152E 11568 bytes
SHA-256: 6dc824f9bbee09e5e5ad7a20d20a33b6157c108779e5952656d72a67ae583195
font_02_sfnt_off00013003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1