Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfeaaee119fd4ea7…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 15:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 21ef0da4875046501d76bfb4335192a3 SHA-1: f1acb1f319bf1968460af5995e4c309d3a3976a6 SHA-256: dfeaaee119fd4ea74a5b69529e699f0bd77b0fcef1bf1cb540538198c819542d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://medvor.ru/uplcv?utm_term=inclusive+growth+vision+ias+pdf PDF link annotation
    • http://capitolmetrophysicaltherapy.com/files/files/makivogig.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/sokod.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f80daf25c2---60570515167.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/zivolarelojuzizi.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a6a0d23d7---43107008464.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c2419579ebd---80340802505.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/wabenevijaluxor.pdfIn PDF document text
    • http://vina2002.com/uploads/files/joxowiruta.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/zuzesesabijifurojidawajis.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/vikitabimeriwidi.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/xageruxujupepunitileb.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/pifugizurotegizizinov.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/3a6f2900591e82fb8be6ac11567541a6/6407483852.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/96470503799.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/19620395815.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/0615b3040ad9e7d38adeafa3b8885531/39517431564.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c121810c5d3---26364698152.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c57d1e65a---runasupojemoxivifowunikem.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/20488218431.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/kivimuziko.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/werereninokalilusaxu.pdfIn PDF document text
    • http://195exim.com/datas/files/27932384035.pdfIn PDF document text
    • 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_off0000d8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CB 11100 bytes
SHA-256: d9e2aff9c912ebe561f51c213b91fc8656eb8172dce94a8f36e80352ea70324e
font_01_sfnt_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A91 17372 bytes
SHA-256: 336c9d19c168a4091455d71a85e3c71b4f45addb7de50386d86ed8faebbaffc3