Malicious PDF — malware analysis report

Static analysis result for SHA-256 681284a37a8d1720…

MALICIOUS

PDF

88.2 KB Created: 2021-09-06 10:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c2e77cb79726a79133db92e21d4a6fc SHA-1: 56d1dcc3b2a7b58e1a07da577d46a8fe887f4bc3 SHA-256: 681284a37a8d1720f8cf4f802d0077285df11fa59d9b24508e2f887ab667b3c7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or SEO manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://hanstime.com/userData/board/file/14065177206.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610903d062d21---62907838921.pdf
    • http://skyline1968.com/clients/74864/File/36604889293.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/43a2e1caa5a3718e13b21d38fd45bae0/11613410100.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/5e16713d84e75b50268ff90e7d6ee387/62466217483.pdf
    • http://oryginalnedekoracje.pl/userfiles/file/refevi.pdf
    • https://sonarmusic.hu/up_image/file/58703155156.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/famvcb3ng55esfqu74nuu5r6d3/fuwivitujabadimazoxole.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/62cd79a11ed681988d376a22ed435562/siwitupozewefobaliga.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613565a8a97a6---90756522857.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/m2rreadeqmppkgt4ogen0rchgq/24793966376.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee4178157e---mosegaxab.pdf
    • https://comfort8889.com/upload/files/93666079431.pdf
    • http://jingchengs.com/jingchengs/ckfinder/files/20210628092610.pdf
    • http://lideparts.com/userfiles/file/1625167224.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/51587a7033c69131463c8ff20ac4db42/95743154400.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/5807bded68cbcac7595e7cdc4784ee2b/34817832141.pdf
    • http://hindel-relax.ch/ckfinder/userfiles/files/zotulupejodewu.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/uegijcm3offh1j79v6qau8qvet/kosemerulu.pdf
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/pixafikunetebomanugaker.pdf
    • http://chikatere.com/Upload/files/serevivo.pdf
    • https://justbuymeds.net/userfiles/file/tixufifejewubapuxubesirup.pdf
    • http://mmckno2010.zkosuchdol.info/files/31842831739.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608262c78ac38---mosewalale.pdf
    • http://kartywspomnien.pl/uploads/assets/file/kolimurimugedamixisijafi.pdf
    • http://chaukitchen.com/uploads/files/gadifisotoxawazibudev.pdf
    • http://taxilitomerice.cz/ckfinder/userfiles/files/52542711460.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=muscle+and+fitness+october+2018+pdf
    • 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_off0000ee45.bin
fb25cfef6580bddfebb1a8211c6fedcbba470ee6a1516ca4604b766e5de3b014
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 11348 bytes
font_01_sfnt_off000108f3.bin
0e6480f2e5edc34f3b8f9ed210b411d468ea9883e7769c9828ae5e5b1e8578ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 19212 bytes
font_02_sfnt_off00013b5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5E 16792 bytes