Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c57a9ddec6ae5a9…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 17:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cb5fed1564f28cfe03dc886567ccb93a SHA-1: d8a72ff8740416ee29e53e6595a02c5cd9b8258f SHA-256: 1c57a9ddec6ae5a9fb88c3274dd6802079fc54815de0c15d3b957c90611e8579
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7e820300a69dd640b28e68025a76e7e8/84241933994.pdf In PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/6rd0kftjj1an7kp8gi3pt983nk/gubexamipiwewijipilek.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210814075155.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/44280584833.pdfIn PDF document text
    • http://trevorhannant.com/85055574126.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/63256202070.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/pifosimelitux.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe811eb5a8---11530339070.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/96966884157.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/zabonogurem.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/c75c097e9cf0ed91e2e447ce31bc6d93/lojawerisijajozefetofe.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202108/file/1628053236.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/43967019529.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092472091e76---16934726622.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/pemelagakejawevuz.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/ruvulezal.pdfIn PDF document text
    • https://patc.fr/imagesfile/47830178702.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/1560526696.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/rirajotevaporelepa.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/51466155375.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/75383211189.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/gakijadal.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/9fb5c73026dadf5a7f1daffd88898227/tomomawifenizuk.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/falelaretopepepopoxi.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/19218641315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=samples+of+cv+for+job+application+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_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 17696 bytes
SHA-256: b623a5ff2143c182a616af1f47ede34b786a887e0bfcc73b822a93c68f17e53f
font_01_sfnt_off000108d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D7 11192 bytes
SHA-256: ae7c1c24ea8c79ccc4be18f86c4a8f07db3f2e782facb2ee7c496556e5da5eae
font_02_sfnt_off000122bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1