Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea6465e941a194d…

MALICIOUS

PDF

87.1 KB Created: 2021-07-14 01:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 119a92a02f2913bdf3f45f74c030c38e SHA-1: 37f5ec1946f85fa049a658f9157667e1946f0a66 SHA-256: 7ea6465e941a194d3451d23249ecba5216ea17156ba6bfcbf0f9b6439b77d019
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to distribute further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://jjmcp.jp/userfiles/Image/file/11317434566.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/dkvngkrf00r2b5fedumg78taos/78287204698.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/53048245178.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876ed27c7fe---nejov.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/5j59a7uktsng9pr30mjrqdeolb/97177171485.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838ebf31060---53548768999.pdf
    • http://nakajima-ya.com/upload/save_image/files/papilum.pdf
    • https://universal4shipping.net/userfiles/file/nomobarekabaxotamisew.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddc19cf8b5---53348307163.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae0d7c0b61---36091333135.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/aaabf395c9554a276f25359c0e48f1c6/sewafawobuwefanugofa.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/f1a87b8a2a68bc3c091f045bc87623cf/48185179212.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608baa1b64f53---51828097639.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/27166226023.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fb3e9f458---zituxosodikeluwof.pdf
    • http://seventyfirstclassof69.com/clients/60772/File/getuvitijuk.pdf
    • https://tavio.ru/files/file/4348594905.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160af66ad7dc6b---mowufoxedukasorimagufoli.pdf
    • http://s-privod.ru/userfiles/file/ragepobimotefo.pdf
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/pemikumovononovasokuwo.pdf
    • http://quickvideo.nl/userfiles/file/nupupofub.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ilbipdir5foh1e05amka14d0d8/25305063594.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dc7a813326a---68353898779.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=periodic+table+electronic+configuration+of+elements
    • 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_off0000ee74.bin
be59b98a705ad26edab8de7541d23b6af2a122c53cbe8aa8e30586bcc246aa3d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 17732 bytes
font_01_sfnt_off00011d04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D04 16792 bytes
font_02_sfnt_off0001351b.bin
d585f8530686afb195613ee9444ee71f1c040f0575f850a83f7ed155bb6ae8f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1351B 11060 bytes