Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd32da988634e49…

MALICIOUS

PDF

79.6 KB Created: 2021-07-08 05:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02ef64c45213e19e891740efd60773d1 SHA-1: 3cbd4e9d142de58c356ed26c922b803982eda5e2 SHA-256: 2dd32da988634e4935d2a791c771a7fb887cf2d4b0a42e3d794535198ddd0040
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating an attempt to lure users to malicious sites. No scripts were extracted, but the presence of multiple suspicious URLs strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 https://asharfilalkulfi.com/ckfinder/userfiles/files/kitokikidosodunasef.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb293ccee9---poxafasuwe.pdf
    • https://rumahbaruku.com/contents//files/73105182982.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc696360e3---nukepudezitesokilu.pdf
    • https://1877painters.com/FCKeditor/file/zefevofowebidigotogije.pdf
    • http://debandhelder.nl/ckfinder/userfiles/files/woxetajenamukonedo.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/8mmuqqpl57odb5mfq0v17mnnjh/81986384859.pdf
    • http://didocrosby.com/imagenes/file/vanukibe.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/468rr6otpoub70k2204miuukt7/88501074636.pdf
    • http://webursitet.org/Files/file/53147389680.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/02k4ih2r4ggiilj9vufsafecq7/63057818557.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f6644583c54d1d331652e903110a46e2/74144566949.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c71babf2a1---56179866873.pdf
    • http://traiteur-ribot.fr/userfiles/file/62506105525.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f9876efff---sifuralarowovikosi.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160850488399e8---vusuwimasosixu.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/v5mu47p0ur5415jvm0g3h6ik6f/84164303414.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b85e8a7ac4e---vivazelajupilidaxu.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c5e8c2d3326afafb8e5b7de24828bfe6/52878577676.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd25f2dbd8c---nonabapopizagebinid.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3130361f20---67088210391.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/9a78af8a9b0ed5eb09ebc064d823bf89/luzelu.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/nilevodedafemi.pdf
    • http://quanhoangtsi.com/upload/quangtri/files/dobukivan.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=typical+breakpoints+for+responsive+design
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdcf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCF 16792 bytes
font_01_sfnt_off0000d5e1.bin
7089576f54aa4e96a31051f66cf0ae773e1eab61623bcb77d03c1049752b4878
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E1 16384 bytes
font_02_sfnt_off00010059.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 16312 bytes
font_03_sfnt_off00011665.bin
337e17e990df0a092e19a6854cb806fe1dc88ea8c64311e6936662c24e292e97
pdf-font-stream PDF embedded font (sfnt) at offset 0x11665 11168 bytes