Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ebba0f0751ef34…

MALICIOUS

PDF

82.4 KB Created: 2021-10-11 18:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2528f48fe4f3e6389bb6ad654862736f SHA-1: e8ba687ce8ea859ee60968ac5492bf5061e59845 SHA-256: 11ebba0f0751ef3423b01f445190474dc6cd3439df45d3c89267f50ad5a0c42a
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 several URLs pointing to compromised CMS upload directories. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and heuristic firings strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://michellenevinracing.com/FCKeditor/file/75033781308.pdf In PDF document text
    • https://arhometutor.com/userfiles/file/4275260754.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/34166399757.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202110080051181435.pdfIn PDF document text
    • https://greenways.at/userfiles/file/bezejebov.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135dab766000---vogota.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/40453419731.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/93449377315.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/79693529153.pdfIn PDF document text
    • https://petroservice-eg.com/userfiles/file/28092352012.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/3746123923.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/30479332030.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/39030371785.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/joniwarup.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/vugalekowukex.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/datazabame.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161589e94c9f48---xizilirise.pdfIn PDF document text
    • https://angem.fr/userfiles/file/sogafim.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/43ce78e375ed57280dc295e54a3ff3d1/zojefeb.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/misefamitesidukevaxogi.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/15099924914.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/jomusoribuga.pdfIn PDF document text
    • http://fivelscope.net/fckimages/noneketojegonubapeno.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/43bb352e259a38f721bb5575df093293/62904956911.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/6Zflnl449io/uplcv?utm_term=best+fps+for+gamingPDF 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_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 19412 bytes
SHA-256: d8abb0bd92994729de765b54bd38477bc82c21f2f8480d179c769f92c741920a
font_01_sfnt_off00010be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE4 10708 bytes
SHA-256: e973dd67d168d0e1040e2df64117823e29b8ecbfd3d70a8f4af7054c495ebf51
font_02_sfnt_off00012484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1