Malicious PDF — malware analysis report

Static analysis result for SHA-256 5163e3c37262e255…

MALICIOUS

PDF

77.1 KB Created: 2021-09-22 10:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b0a78b2776f7c0652c075fc88e011a0 SHA-1: 95b96047463c0f18fd649c7b4ad4ca6cc01214ff SHA-256: 5163e3c37262e2559ff7c02231d7a9ee59daa97568d2969b87a681b557c42df1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f05f674f5e---54969911561.pdf In PDF document text
    • http://chikatere.com/Upload/files/35530506339.pdfIn PDF document text
    • https://eventaipei.com/upload/files/86859764398.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161480f3f4909e---xetujesetumi.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/zafuzepexa.pdfIn PDF document text
    • http://360global.ca/userfiles/file/11633657481.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/miguzaritorixasedif.pdfIn PDF document text
    • http://prograsifkalip.com/files/sujinogipozalezesa.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/gefunuragulenepedobogud.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d480315e28---27148303352.pdfIn PDF document text
    • http://charontrade.hu/data/file/reralulapozudu.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/57266084584.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210905_0B518AE74DBF07DB.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/38445315087.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/rivotuper.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/regomuxadimulaku.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/paxokalejejisubavame.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/94590285725.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210907130217_1267736295.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/9406281618.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/jivolojajo.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/nexowazaf.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/6b5104365f2a109953054d1a8a36a888/70546128111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=house+season+1+123moviesPDF 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_off0000c918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC918 17452 bytes
SHA-256: c0a4edfab810262888620d0883010a8a64a1d5916b3d2fcdcaaa8520ac82505a
font_01_sfnt_off0000f67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E95 10524 bytes
SHA-256: 00846b0a3114ac08fcbe3d959be76ab7c01eecf04601d6435a8e196539b169c4

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