Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f1552c8b3c681c…

MALICIOUS

PDF

75.9 KB Created: 2021-09-05 04:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff8fd0bb29bd84df057b21b0bef45efb SHA-1: 23ad216822483aabcc063b834eaf7a5b6c464242 SHA-256: 77f1552c8b3c681ca4510e657409250ed621f66e7d0a728ae4b6dbedf0d52268
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the use of external and potentially disposable hosting for malicious content distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5256db9fe8---74311250091.pdf In PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608333117d671---58798099055.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/87864955202.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c15a143c95c54eb71661f879bf07de3e/bakudavaza.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bbbv06die2qr5822fks229sbn9/pojopulez.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/wozuwedikadikejorukarekum.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/nuginovamoge.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/27778553678.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/tuvamuzixit.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/tazusoruponisoduledi.pdfIn PDF document text
    • http://esangsok.com/upfile/files/milolowum.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/gepinunadavefovaladip.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea07722eb8---64263748787.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/83092005800.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/78510177671.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/9709d56906e0baec574b2dfc9247b5fe/80021675584.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c861732dbd---60310078576.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/pakob.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/c20ec10f6de5d25457047dc4f7740d59/vogalekatide.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161260a4a766fb---70454485469.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/sanulewamenidareze.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/jepipele.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b626c547b2b---38812898984.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/87125521752.pdfIn PDF document text
    • http://jadeite.ru/images/file/98282077560.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ebed24192---nedoliserevetaduf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=osram+automotive+catalogue+pdfPDF 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_off0000c3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D7 11048 bytes
SHA-256: 87a519a9126e06d4e2c407b7b7f9560a045fac525c1722b973685e5308a5efc2
font_01_sfnt_off0000dd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD77 17012 bytes
SHA-256: b3bb295ec5a033e31d8e1360e0f7690b1daa007617ad23d4302f9c08e05e166d
font_02_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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