Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e3d1e4d904c454…

MALICIOUS

PDF

79.1 KB Created: 2021-09-14 12:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 050ca1fe43741373af5e7615105b88fd SHA-1: a6bfef5951a2805a30489c7e2110fa33ff528598 SHA-256: 95e3d1e4d904c45486c5c2c2a69ce4573b2e647b59899ad29ef2d584e16e106b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=how+to+get+into+a+locked+android+without+the+password PDF link annotation
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/f5jqgdg1rsgfifesgmkd2iag6k/linisolewodesalotox.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/33549056357.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210909103347.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/944af4b625d84ca1c94c27c3a86f8945/82303092970.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/juwavu.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/pitadosurega.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/40740783755.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303de9593a6---17733051155.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/vefukoder.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/38620774429.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/turatuwotu.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/fepotijojugopabimim.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/ligiritavixaxasaruwo.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/muvubemunegukazeke.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaa7844538---22923476467.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/gebewumevida.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/jinasimuwat.pdfIn PDF document text
    • https://petek.biz/resimler/files/fuvenujumimazod.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/69758303498.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/52643165093.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/77555306544.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/julolowaliniw.pdfIn PDF document text
    • 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_off0000cba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA1 11064 bytes
SHA-256: 47dfff5e162ec1d6b217982468bad1a54bead2aff7ed92de61af57c4f67f6399
font_01_sfnt_off0000e528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE528 19048 bytes
SHA-256: b203d5e804dc026750330b510b5f48c71cdcdf567a759a7c7286038d7698069f
font_02_sfnt_off00011663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1