Malicious PDF — malware analysis report

Static analysis result for SHA-256 e410e347eb58edf0…

MALICIOUS

PDF

91.4 KB Created: 2021-08-07 08:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4ca4154be99531861b0362d26a1de877 SHA-1: aded30870efffd9a0486a64e9ad6b08ab07dfc81 SHA-256: e410e347eb58edf0cda800c8d9dcb96892af9e9216906d79a5fe564e6f597ff7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable 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. No scripts were extracted, and the document body was unreadable, so the analysis relies on the link farm structure and heuristic detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://chcial.ru/uplcv?utm_term=what+events+are+mutually+exclusive PDF link annotation
    • http://omni-links.com/images/blog//file/73427809562.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/56fe32aba15018d044a55708588acf32/68924280745.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/210414509603.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/82585317803.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ol98us2u4m0j2ji8jkgu2i7jst/derikaraxafekuletadele.pdfIn PDF document text
    • http://maihome.hu/admin1/file/46708062548.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ffe51e5794494e4d791b7a46016207ed/tilatapadumugixewoxasez.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/dupuvikib.pdfIn PDF document text
    • https://stadion-nsk.ru/ckfinder/userfiles/files/pogomapaw.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160907173482c6---gupudojulenulisija.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/98495887821.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074b22f6c2fa---pumebilixuxofovabezud.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/079i5v91u9ev97s1j3q5de2dq4/nijovosuresidom.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/9967912518.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a24661d41---vazurumug.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/guvotulapikenajuge.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c59788041c---wevemaf.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085720b5b969---nazegalegiwekanuwaf.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/wozanigezubuvibolozatemuk.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160802e91a49c0---30336044646.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f436779ffa7---jenekerobuvajufaxuduka.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f839e3fa1---nazas.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/pibamufiwax.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/lewijiginil.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_off0000fec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC1 18004 bytes
SHA-256: 4124d5d7588cf4568ff4114d6bda6902afbe7cd107cbad101dbf57ca474824f3
font_01_sfnt_off00012e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001468a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1468A 10752 bytes
SHA-256: 354bec944ae3c2e61e982b40d306af4956b04c910b9b5a8e0809cd38e7b6e478