Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff419e941c0297b6…

MALICIOUS

PDF

87.3 KB Created: 2021-08-30 18:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f442fdd847c8ae0b7ba310275ab19505 SHA-1: f727cdb95b88ff8a4670d75c0fef7c1f0e42fc5a SHA-256: ff419e941c0297b69c63e5601da25720b6b755ddee38bc88fd9b5df19bdf22f5
156 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of numerous links, including those pointing to compromised CMS uploads, supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://pi-consulting.ch/download/52509074627.pdf In PDF document text
    • http://dailitara.lt/bites/uploads/file/11606461672.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/rugog.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/40886749431.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/roxewuzid.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a885de91cca---fomigux.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/mumitomu.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/74417644289.pdfIn PDF document text
    • https://bhavalaya.org/ckfinder/userfiles/files/75546182852.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/ritajiwovo.pdfIn PDF document text
    • http://tktravelkorea.com/FileData/ckfinder/files/20210826_D50D21FF579F2AEC.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/17174816356.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/19219161109.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160942a9da1fc3---94496647342.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/sifereromoputojoveramu.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/47914966275.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/qc0t4tajhs4k7uo4959ogbm7v2/jumuxofum.pdfIn PDF document text
    • http://mfcpavpos.ru/file/taparigodubotejarosumefi.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/nujoke.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609729265156d---59609278181.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/sogino.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3f27352ff---20813962726.pdfIn PDF document text
    • http://soles2walk.cz/data/file/gaxiturotefub.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/21/file/28544501261.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/61601995536.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210811_DC829B2523F8CA8B.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=a+doctor%27s+visit+by+anton+chekhovPDF 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_off0000e95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95D 10848 bytes
SHA-256: ccd77b41b8733f175e5fb87b15f5e2d686274b635b266cd80c49dd4b5ef87526
font_01_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 19984 bytes
SHA-256: 242f3d49b0304e44aeb430a2085d190bc3824e9f7aec6455d3319f5f8c04162e
font_02_sfnt_off00013654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1