Malicious PDF — malware analysis report

Static analysis result for SHA-256 441227f3c65cd2d5…

MALICIOUS

PDF

96.7 KB Created: 2021-09-18 02:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ff8dd2b50e8b69db04328fea3f5a6e5b SHA-1: 5b9037aa81b8339dc365ea7fba248f782d08c65c SHA-256: 441227f3c65cd2d520b41d53389c07cef1c654e54348660a0dbc8a88118bf650
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://irlanc.ru/uplcv?utm_term=minecraft+java+edition+in+mobile PDF link annotation
    • http://kapelski.pl/userfiles/file/76573764539.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/78960715074.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/paxisiz.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/60201727855.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/24610305012.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/fojixofulikepixufiwedoto.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/62823771020.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/21115023654.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b781447b1e---4315789438.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/93986871057.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/fukivenerinamitanuraxob.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/49769126882.pdfIn PDF document text
    • http://yilip.net/userData/board/file/laxeg.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecb4a95b1c---kovejop.pdfIn PDF document text
    • https://digireg.nz/upload/8929400173.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/tukoviratakixilubavuji.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/fivazazozijalewadep.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/sizonipan.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/bubupez.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b39860987e1c299079dc98577f6243a4/guvimurenu.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631032192.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45162350602.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a0932c55b7fdfbfb41bbd631153f3199/17241547685.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_off00010fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB3 19764 bytes
SHA-256: e397198483c4905a15861ca2f5df037cd8018d7914aece3740ff170f2ec7ea40
font_01_sfnt_off000143ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143EA 10800 bytes
SHA-256: e180e417ddab583ebb6534fee50b184ad4cf146c952bc3261f2555768b152a95
font_02_sfnt_off00015cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1