Malicious PDF — malware analysis report

Static analysis result for SHA-256 925458fd0518a226…

MALICIOUS

PDF

76.9 KB Created: 2021-09-17 10:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 07a72b602964836b0364b814b527132d SHA-1: 1b5a1dffb8234e64ab1ef8026939ebf38705b40e SHA-256: 925458fd0518a226776059ef4a4f656f6325f9f4a5839aa796154c774ab62a52
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. Several extracted URLs point to compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of a download button lure further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://juncheng.tw/upload/files/21943235648.pdf In PDF document text
    • https://smsenerji.com/resimler/files/99894823043.pdfIn PDF document text
    • https://kultmotor.hu/images/files/motejerepawibagup.pdfIn PDF document text
    • http://hk-keber.de/images/file/36784524196.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/nugosamu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d253a4ddf---kemipilibe.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/sasikejixolosivanu.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/xiwotibiguworugizoxu.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/nagigojozumu.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/kanobifak.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/muvalububaderezovevanizaw.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/73830560113.pdfIn PDF document text
    • https://premium-house.uz/images/file/66582540023.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/bipavinu.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/19195586537.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/xasasofisopowidep.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d1cb3851c---lomosisuriputib.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/jutokodonuvoxesa.pdfIn PDF document text
    • http://ty-int.com/files/files/91184748416.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2c89d538f---2744738074.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/95708115268.pdfIn PDF document text
    • https://gdaniec.com/upload/files/84728713414.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/zubuzutidivamuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=american+speak+out+intermediate+workbook+answersPDF 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_off0000c243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC243 19084 bytes
SHA-256: 83c298c450244be2f392fa1fd199f0aeb8fe65dc6f3b8ba9ec8faac5aceea0f3
font_01_sfnt_off0000f3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B4 11028 bytes
SHA-256: 79053124ae25e5e6dc7a0fa8bdaf819c9b812902d85ab913ea488646b841a7ee
font_02_sfnt_off00010d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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