Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc65831e664d25a4…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 03:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6aad63c5c2f0341a002eb214243f324b SHA-1: b3c33c3c4323cf77494aa92b5324ebe9be6f1482 SHA-256: cc65831e664d25a466288335e0943cce5dc8e0f2d8bc97ad24878bd4a15f920e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The URL 'https://smidgel.ru/uplcv?utm_term=v+bucks+free+fortnite' suggests a lure related to free in-game currency, a common phishing tactic. While no scripts were explicitly extracted, the heuristic firings indicate the PDF is designed as a link farm, likely to distribute malware or conduct phishing attacks. The ML classifier and ClamAV detection strongly support its malicious nature.

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://smidgel.ru/uplcv?utm_term=v+bucks+free+fortnite PDF link annotation
    • http://pscworld.eu/ckfinder/userfiles/files/29311610585.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16145102f5a90d---sopobi.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/10957196625.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/mikomiwaxumewujub.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/rojaki.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614368b88e608---94514008306.pdfIn PDF document text
    • https://kopari.hu/files/file/15022376513.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/49609800631.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/dafevopijapofobuv.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/84094069061.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7591447f7---13786159034.pdfIn PDF document text
    • https://oasis-travel.ro/files/29644439099.pdfIn PDF document text
    • https://mentormedya.com/files/59680135586.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/10478383834.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e17134a0649f645d6a3580f6b82fe5e2/jarogufodal.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613904cf7a221---sosabejajubebixila.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/notemuzetu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/20c9fe677a482396c0537dad56626ef3/23691653962.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/jevopixududijepepa.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/wevurafovaxufaxexajadeg.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/peletenipilun.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/34847864939.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-9/20210909122647736464.pdfIn PDF document text
    • https://il-gusto.com/images/file/23896290366.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/sumapixaxovidufevajonekup.pdfIn PDF document text
    • 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_off0000e1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 17680 bytes
SHA-256: 0d78a54b23cafaad63b69121f353b7333d017c1f3bceefa7f247188f559f76cc
font_01_sfnt_off00010f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12783 10420 bytes
SHA-256: 7dfd46a9b6ba10d0c2563786188323dc9554077b1afb3ac8034ca767a77789a5

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