Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc677f38f2ff309f…

MALICIOUS

PDF

124.9 KB Created: 2021-10-10 09:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a3e1ef92c0ca4c05726fd9e9ea6010fd SHA-1: c17b93665cec1e20fb34f0230f543bf99dece578 SHA-256: dc677f38f2ff309f799f11647155d230e54986991b552d6510b878760ab13667
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malicious redirection scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

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://brianhigbielaw.com/UserFiles/file/pilovugowesuworug.pdf In PDF document text
    • http://premiercontainerlines.com/media/ftp/file/43663181475.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/58753674961.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613540d226835---20881799332.pdfIn PDF document text
    • https://kawanmto.com/contents/files/jogasexe.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148ec74778e6---8377820516.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/70138792620.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/toxajulalarorexiw.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/maxirumeborenoxevar.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/sawud.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/fimajufivezazeratolom.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/subudana.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/waziralafotuvanikire.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/gm8cq8oj46iih2krbbsup688lh/sodopelikawodimojo.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615653b5d8efe---xipagafelidunovawojigire.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/bp4ai5te6uvd68thd5ok0ns542/vemafimewa.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/90016266573.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/wixufiwudobalovewerulofiw.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86e86f87c---xabarutiwilizimonelis.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/xofujugevawudoted.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/37208660634.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/60482540711.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/17923529837.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/nibafoxagumo.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/2e7c9911212ec17b371248a96e6e2957/belutosiwo.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/rabonex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=call+of+duty+black+ops+xbox+360+manualPDF 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_off00017b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B2E 11500 bytes
SHA-256: 6bf4544ce153e5128590d12051d42aa47540825c94e5736fd7a4741fdbca3e13
font_01_sfnt_off00019648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19648 21040 bytes
SHA-256: 13d9860dfcb3101c65cae4e5f243e2e3d877393a268c2c8de20239e8fe41e89c
font_02_sfnt_off0001cd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1