Malicious PDF — malware analysis report

Static analysis result for SHA-256 628dea5299f3f2a3…

MALICIOUS

PDF

78.3 KB Created: 2021-09-05 22:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 296aaadb782438faf2d65592e5d26cf3 SHA-1: 2c9763e129561156b97917ba9c876ea42a0d07db SHA-256: 628dea5299f3f2a3ab5733716da8c8e82debd10075fb86f0034a092316e7d2d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish for credentials. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://intrinhgia.com/admin/webroot/upload/image/files/47008867536.pdf In PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/71e300794f5aa756dd3f5fa510df6c80/pamudaxabumogu.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d8abd9262---topixejaborakimazipigeben.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/mezogufewodepepovibo.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/31509136229.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b35697b57---rodigolewadazemixize.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/gsft7q6g0n3vblbaj6cnmu2ujb/68043837357.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///rojixina.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/89657405846.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/mowenakori.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e76770a58d5---kopanabilanijutebasunev.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/64167015296.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c4deb5636---jidotapew.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/50f40d4660b1709d60e6d13ce958815d/49226544152.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/48244765310.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/14137647312.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/jidoduwasimafesisedid.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/7073843729.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4615ed5e405daa96a1ad69d23d52f65d/gapapibadod.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/42924129712.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/e467e1d5353fbcf04d6d9390e59842bb/58328616232.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/57663876584.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/be79e2814d5d31d792184e85c5616d67/jewogud.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/950739d824e863783e1f99d9c2061436/wopedazugubevobar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e50de0941---43670186718.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/vegisikuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+innocence+project+worksheetPDF 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_off0000cc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC26 10536 bytes
SHA-256: 409ed182eb2107175c08d29403cc80381eb833c8cba3348a41a785fa208b4ea4
font_01_sfnt_off0000e427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 18104 bytes
SHA-256: 34fb890da1c330debe93ec9b54f317f76ffb272280177a75d13fee8d65e1b495
font_02_sfnt_off000112fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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