Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7df0347909bbbf8…

MALICIOUS

PDF

85.9 KB Created: 2021-09-06 04:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: babb4a496740dc5f2d3f7fe73f7d9714 SHA-1: 309f0e52e851d1ff1ed073b2ab922350bd61d31b SHA-256: c7df0347909bbbf856236da0475f7a2e0a071b446b252271254ad985bbbdfbd1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://15441707.com/data/board/file/20210803005449.pdf In PDF document text
    • http://klefmarken.se/upload/file/vifato.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c948c850595---zevibilewanofiwekife.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610a1b4da7751---fewod.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/26206805043.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/56275666338.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/837336d277685a4eb8815117e24d17a3/jefalonelonu.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/20398634539.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/wiwoj.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/jimonilafi.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd96522c2b3---movebe.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b6cee2549---pasupijejojoditava.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/46940654653.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/38172798613.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/b2b5d7fd60b413694844733e42377130/85166001117.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b536648c---rojuvuxadirufizefemibiwi.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/lolugozemegonoja.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/disosomelojibujasolo.pdfIn PDF document text
    • http://m2m2design.com/userfiles/8400622781.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ff10405aed16bbfed1c6a765d08f3fb0/vaduzof.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/16517823632.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/fanukamet.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/paxelax.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104c169c0615---27818348370.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/357841aba96dd85b008464ab60cbdb2f/zebudufubefibufokete.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0aa914347f---xideserewano.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/bqlc3c5nib66keetsqkrnfrg8f/90892227408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=happier+ed+sheeran+piano+sheet+music+free+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_off0000e51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 10932 bytes
SHA-256: f57e98b9d963e483c3090f715d89db528f70aab4c4fa2c7fc42adf6fe0c1420f
font_02_sfnt_off0001164d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164D 19672 bytes
SHA-256: 0e7d73ebfce333830b689042a97cf4d59edc453ce203b1a32d40140cec40e631