Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ebe00f456d99cf3…

MALICIOUS

PDF

81.2 KB Created: 2021-08-23 18:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 378088f5ceaab97ae4dc378276057e70 SHA-1: ec469d667c984857f92950b7109f38cfb4d0176e SHA-256: 8ebe00f456d99cf3e1f60c2d327a049d96fb41fd0282f0c0245398a503d8d144
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple 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 phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=sufficient+meaning+in+telugu PDF link annotation
    • http://donateagift.eu/userfiles/file/mawaxadifesubepekedixe.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/68014700.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/nokoje.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210803_192931.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/telogobunitivo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/7ddc17c2bb2ecb076f0cf9954a6b86b1/panipo.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/xuxepurinuzifufejizideze.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/wejaj.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160826d1d9fb77---pudabazukasuvaxoz.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/xetikega.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/muteniwuwamakekipivutukid.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d45fe620b---magubatizanimoweradigeza.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/758prf4gma161q2jatuq06bpk1/66750772813.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/33935168764.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/kizimepowepopitexajojus.pdfIn PDF document text
    • http://digireg.com/upload/19498121796.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/11699086167.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/vugununinoregezemumipegu.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/vikina.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/11105437269.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe574368a8---bafasadovaleteje.pdfIn PDF document text
    • http://agavietnam.com/img/files/nodabebamiruxisedafikipa.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e83cc41672c---voluserawuguzopuzoxufewa.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_off0000dc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 10468 bytes
SHA-256: 4f5c62b1e8a6c3722a57743bd6f3d4ed42445e1df0f3798bc1e2d4e46c7fb8ce
font_01_sfnt_off0000f451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 16476 bytes
SHA-256: fd9dddae850a88a5682ce4734c130d5d63b582643d4d6341f599d63d632943c8
font_02_sfnt_off00011ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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