Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a185fafe35ef421…

MALICIOUS

PDF

88.1 KB Created: 2021-09-13 21:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76c509ec6bdfcd608871d1a1015b99bf SHA-1: cffdc182595805268661381e97c21bc9cc251f92 SHA-256: 1a185fafe35ef4213f4ce7f9156ff0ced199c04bb26efa1ffaba97480318a87f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://zge-led.com/luodan/images/userfiles/file/kudabisavasejalem.pdf In PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131a4bdeaa82---foxabipunudekezulufu.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/midetagizubut.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/41850616200.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/59754221558.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311174327e1---57656121494.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/78462718069.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/11f925ee31f3c2cfcdddf08a9a149207/voresiponakagugujilu.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/nivamul.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/69004172308.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/rinabemixudijikanisorog.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/8770842795.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/69796768256.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130cf1a69893---wavejipisavavitusoxidita.pdfIn PDF document text
    • http://fivelscope.net/fckimages/17174673351.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/6071tpiee4rdm83s2107ra4t0b/31415222716.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/2712580832.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/paxabuvoja.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210911_A7B70F04504163CE.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8db57599f---kinewuwobudeni.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/wexufozij.pdfIn PDF document text
    • https://ksuskalology.com/images/file/11027494927.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b998f89d69---69592699243.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/kupibelat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=label+the+parts+of+human+heartPDF 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_off0000ef1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 19416 bytes
SHA-256: 4a35d2ebaa02953bb12b4477bd86d8b8450ae8a811e07790f5b621d92f2821b8
font_01_sfnt_off00012270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A87 10728 bytes
SHA-256: 26d2e7575359001e08ff8a113836319a9439aebcad661e5c421d8ac527aaca71

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