Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda7dba3cb0a44d3…

MALICIOUS

PDF

74.8 KB Created: 2021-09-05 20:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6948d5c59700cbf2f70cc0cf55912579 SHA-1: 152ec2a21d5f85028d6d459e5203ee270d7c853f SHA-256: dda7dba3cb0a44d38b1c16bd5cda9c87efc9bcbcd75a8f37aa3a00a2927401ae
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 functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS upload directories or hosted on disposable domains. This pattern is commonly used to distribute phishing content or redirect users to malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://savoie-outils-coupants.com/ckfinder/userfiles/files/rozuvokij.pdf In PDF document text
    • http://vectorma.ru/uploads/assets/file/14939201782.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/kunibenipurototadiv.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/jutazuluworipitopewowez.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/romas.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/63365453218.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608263158cb10---91972077709.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/h2g53hi0st8k3mq4vbu3vishpv/paravodojunibuxij.pdfIn PDF document text
    • https://onecre.com/images/content/files/jetejavamuzix.pdfIn PDF document text
    • https://tigapilar.com/upload/files/fuwamotugexedufivera.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/39943123110.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5af49f99c---nuturupomewenavopelipu.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/f2a45a4b77992ff8f9c310ece1cd374c/88363116770.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/74464782316.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/23987862419.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/zafudejavosuvudimobazageb.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/bodufakoxuxebusumodo.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/94488574298.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce40c203dc---bozorepipuzepazarige.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0a3732b6---dukudalodojigamipesolor.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/86419880747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=let+it+be+ukulele+tabs+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa1d21511b2---85486071377.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_off0000c289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC289 16952 bytes
SHA-256: 471a2eefc7b0df28b24f4144f514745dc99955fa3f143103f13a63a0c0e47b33
font_01_sfnt_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10670 10456 bytes
SHA-256: bfeb7ac9fc5457c15a65452acc2fdea575e30f280ff80f60a6d8c2a4f6c79cbb

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