Malicious PDF — malware analysis report

Static analysis result for SHA-256 11daded91117990a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-01 02:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b856cdcd88c48eb60e7247ab288687dd SHA-1: e7a9dd149ce10bdda34d4d2a1019514e78f8b113 SHA-256: 11daded91117990ae33cc9049e57f40c269f40dc2a02fdc19366086e0cda2f34
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These links likely serve to redirect users to malicious content or phishing pages, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109e5ebe327a---80774219013.pdf In PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f84044af4---34247094453.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/9463dc7de4fb70aaf290b9b0b4aa1bbb/97472728101.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/27400496820.pdfIn PDF document text
    • https://nevisnews.com/userfiles/11506516627.pdfIn PDF document text
    • https://bfull.ru/uploads/files/xupabufewewomumusop.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/149463cf78a799ad6deeba5ab60c5914/ravajijakafamer.pdfIn PDF document text
    • http://jpmoto.biz/upload_picture/savusojozubojil.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/60066351755.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/dimerudebubojewovusafabo.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/45372778520.pdfIn PDF document text
    • http://techbis.pl/files/file/zasirimasutesilegi.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/59914012297.pdfIn PDF document text
    • http://raczcsalad.hu/files/13313475219.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/vokuzekopajarafa.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/21845510473.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/sigevekizeleler.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/43816891302.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/bezikazawerofuligowuginog.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/56b2a31dff33e5e31bfbdbf38165fc0e/bijomarurajid.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/rimedofelut.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/31864946173.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/5038768608.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae44719eb92---parapusale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=real+gangster+crime+cheatPDF 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_off0000d944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD944 10600 bytes
SHA-256: 44895642a5a5e919582b521b78864a4fb9ae80471dcf7d8d342e8e82e0f60202
font_01_sfnt_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 17504 bytes
SHA-256: 37ed0acd8f9d4cf7da01312171b70ed1f3694d7731e413b686cd2763dc7b12df

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