Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba53735695071a0e…

MALICIOUS

PDF

91.5 KB Created: 2021-07-18 19:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f26e17abb155f71169bc5b39ea182324 SHA-1: f04d39fa23785d0d0f278b346a5e0eebdbcca970 SHA-256: ba53735695071a0e4fa72150ab039c95a7b4fb6dad402e07e7aef323a5057374
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and embedded URLs align with techniques used to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://essaidafm.com/uploads/FCK_files/file/93229673489.pdf
    • http://ciaooo.ru/uploades/userfiles/file/damilo.pdf
    • http://dentherapia.hu/files/file/buvaxopifama.pdf
    • https://defaico.com/d/files/40250617132.pdf
    • http://samrayburnclassof1980reunion.com/clients/873185/File/gemakawifugafadowimos.pdf
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/55934165780.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/vmvk7iol38or6m0j7rbu0fu3ss/50432855254.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083123087acb---2580257469.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758d9e15ff5---sokedexafumigenujaxoxumap.pdf
    • https://cristalensi.com/public/File/witufipukejelewomivuwa.pdf
    • http://mwflower.com/upimagesfile///69661687979.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f70e4e1b93---mamoluzonatomotaxulif.pdf
    • http://shuswapladystriders.ca/userfiles/file/mapofujopamek.pdf
    • http://davisnewfoundlandfamilyreunion.com/clients/60627/File/14304543018.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/2b6dbc525718d3ebc1b8022ec6ba904c/dolutejafanozegu.pdf
    • http://jessicarossitto.com/clients/7/7c/7c16b8c799dae9ffcd1258f31d6ff645/File/pofugopirolitejab.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5c1bf8714138caa05578481245849c58/kajolonezexa.pdf
    • https://giltmorestukko.hu/ckfinder/userfiles/files/putofafal.pdf
    • https://bloomeng.com/uploads/toregogurolijenivalile.pdf
    • https://twr1115.net/files/fckeditor/file/63426758750.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/femejukox.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607258f73a4df---59056192108.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/apjhfn9kn2n4njl3ssvm67p48g/pufuloropemim.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=what+do+most+guys+find+attractive+in+a+girl
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101b5.bin
753500e4538b141a7590369d43470de5caf21816875102f6c9cf19c31e898d66
pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 11196 bytes
font_01_sfnt_off00011b93.bin
419791d2f485c5002e44d0b533feb49dd79908a836989b1c2e8e6f77f44e6e20
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B93 17240 bytes
font_02_sfnt_off0001488c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1488C 16792 bytes