Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c1d5c59e557904…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 19:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3490d1e71b72c47745581cc2d92a08d0 SHA-1: 0544ad9138e66efcac31be2c52f55eaf791ab447 SHA-256: b1c1d5c59e557904890d9e009bfe4640b3f6070be8837414079a5acb7d0e5a75
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to compromised websites, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports the attack pattern of tricking users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://anaksemut.com/contents/files/31754661454.pdf In PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/66236512214.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7739d3c96d---47160556388.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/l7b23tqh70hv10ve4q1bbrt4ls/40204374660.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/51968497723.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719981ba81e---dukumaxowirus.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/39641837712.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1bbee4551e37000ff3234aa32e964f38/79460792593.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210622010235_jy66xc.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/f603038788076a5d442c3625ee7ff5f3/kimebizaluxugutotive.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b09fc66bb85---lozazifixeverujig.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/xakiludiroruro.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/67747712677.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/83d86ba202c062a7bb153a1057a5a329/jadetev.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/dimolovomudebinezen.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/desibol.pdfIn PDF document text
    • http://bwc.lt/i/35540404932.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/bumexisiz.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/vegavavoferevazen.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/lefelowurutamese.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16083397ca0613---1966748039.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/78188033118.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///68127644999.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f9d7cfca5---19938379638.pdfIn PDF document text
    • http://mhs69indians.com/clients/864804/File/vafubabokotam.pdfIn PDF document text
    • https://o-dance.com/upload/files/88771643426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=iti+engineering+drawing+question+paper+with+solution+pdfPDF 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_off0000d45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 19476 bytes
SHA-256: 5e8757f82ae69d5c8e7ecc85c47d3c04e38ebbf2fb986e1a11d4fead68c2c7a9
font_02_sfnt_off00011f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F34 11060 bytes
SHA-256: ea2743e315c6e4c14bb3d16d3459c79c8871aaafa1f92b28bbfaa8a5027d1ec7