Malicious PDF — malware analysis report

Static analysis result for SHA-256 9747af59b1fe85e7…

MALICIOUS

PDF

76.4 KB Created: 2021-08-03 10:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbf4653f998777bbf74631698b920c93 SHA-1: d92c68a3fe880ad3493bfb3a0b5695a2b47f1540 SHA-256: 9747af59b1fe85e71f4a5134c483b2d6b5ab42dd68e63e4e648feab385bda210
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mjacz.cz/soubory/files/68208863564.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6e734b089387e923f648f447da51171a/rutojasuw.pdf
    • https://cristalensi.com/public/File/84993477829.pdf
    • http://yildizteknikelektrik.net/resimler/files/rimowuzuxaboper.pdf
    • http://dunajecbiala.pl/upload/File/korupavedakudixemi.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07f979ef5230e3eff85ae2edb0d804dd/50396438834.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c326be78ffd---91976597717.pdf
    • https://wodepcb.cn/uploadfiles/files/zusifipepodav.pdf
    • http://pierrevillers.fr/mairie_files/file/78891395003.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/0c1985fbaea402752b63ef7173934df9/laromitug.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/f0f9307476d5a6b7db4a0fc691ff40c6/11036352053.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/lvip2ned44dluko0l1dhr7brrm/sevuzu.pdf
    • http://igigeothermal.jp/userfiles/file/bavukedetenimarakixe.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/92206736466.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/7a0190474bb1a93bf0b98d9c2efaa6fe/71735073231.pdf
    • http://fittbike.hu/files/file/75326229644.pdf
    • http://poltinik.ru/userfiles/file/jufowi.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/9ncstr65rfjgsu1l0gs39qg91o/44430190895.pdf
    • https://hondamienbac.vn/userfiles/file/43200823523.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/6kfkj5e7srefbdrrve2cjgp4or/51534425478.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160dc837f88f14---vazaw.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b207eca9b15238e99d76e0689614bb5/xizug.pdf
    • https://kawanmto.info/contents//files/5966839456.pdf
    • https://termofriz.rs//files/sojikefanarabikuf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=all+i+want+for+christmas+is+you+vince+vance+chords
    • 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_off0000c6f3.bin
514991a38b684b146bea12e7ffbb52da42429f48e1efd19e510b297969000f4d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F3 11088 bytes
font_01_sfnt_off0000e0bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 16792 bytes
font_02_sfnt_off0000f8ce.bin
c9b666e38ea0063303b88a11ca376a0615acbe85a1dfc6033cc05eb0f0ec7dc2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 16228 bytes