Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfcb0eae8cd2218…

MALICIOUS

PDF

92.8 KB Created: 2021-07-31 09:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f5b8058f5e2db14dd3f501a50a5c20fb SHA-1: 6084c710215f78fe1974c5676412346cd92598d9 SHA-256: 8cfcb0eae8cd221838a448dc43a27accc413ec3d2ec8edf9db24e069e5c11a19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve as lures to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c30a6de35c5---tevawafigunifusexidigor.pdf In PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/c67cdae0f176a63c84183413b767b591/sitofekonilubefuravonejar.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/kikulejadud.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5e8a80736---68821037009.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/72089432982.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/nivozifafefimusa.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160912bccb52ad---vubokixuwu.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/8a208c81c6a1684a64f5e70c6d73eee6/72330476509.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/adf600dff5da332e3a022ec8aed10994/lutavexelepenewetomese.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/11836547004.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/af79329a2280a0b3df5511be381dcd20/xisubogid.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/qjmoav2j45ivrdbb74ch9jvhav/6717981592.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/7c3db385f15abe2306d1f26b1ddf8660/xetadamewi.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f63da32c8---8793354871.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/fugorugilewuduro.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/n3tfgpn4ovm1a04gkfdpdg3e72/23584137606.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/jetijoperinij.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/wafaruz.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/78445845280.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/sodulobufagow.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/5d39b88088bc0b49dd117d7d8cfc502d/18761639747.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab164c0268---balabub.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/ximexetulaferusalatuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=scrabble+word+list+pdf+2019PDF 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_off00010602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10602 11272 bytes
SHA-256: 06f59317c26221dd2bdf59b7ff1a605f716c0d7bebcd179ea45eb2f16aaf5f60
font_01_sfnt_off00012076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12076 17344 bytes
SHA-256: 1174e949b4769941037e37b15ebd8871bda69da3fa1ceb22b98aeb2ac027720f
font_02_sfnt_off00014daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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