Malicious PDF — malware analysis report

Static analysis result for SHA-256 7752b87d2d3cfec4…

MALICIOUS

PDF

82.4 KB Created: 2021-07-20 08:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff5a5932764a4126fe1a64d75c33351c SHA-1: ef23fc3dfe3824047e9db0350491ef7db7d25fc1 SHA-256: 7752b87d2d3cfec4ed520ac0fa61cee3e43184bf41ff152acb420947460eca7d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for SEO manipulation or malicious redirection. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to direct users to potentially harmful content. No scripts were extracted, but the overall structure and heuristic firings point to a malicious document designed to lead users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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://srihemkuntsahibfgp.org/hemkunt/userfiles/file/woxitizulofofezuluko.pdf
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/rujadulevawejonegirerik.pdf
    • https://luathoanghuy.com/uploads/files/93780443160.pdf
    • https://onderdurdu.com/upload/ckfinder/files/39814627988.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/66990f8f3c76006840328894a26df0c5/rujogefudib.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/be0e0d1797de0732d546bc4fd066f398/69823825873.pdf
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/5fde71122b2bb3a5790e86efbbc94041/lewebujanonavam.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/4589d7762a02c99c195cd52539b558e5/27313541524.pdf
    • http://karthikeyanjayaram.com/userfiles/file/zofibosaxibuvivezil.pdf
    • http://homeopathyhongkong.cn/files/ninofanopafeloxuxol.pdf
    • https://ludifrance.fr/userfiles/file/jewuvuroxikosikaneso.pdf
    • http://rajskiewakacje.pl/userfiles/file/fibidememajopelo.pdf
    • http://nct-vn.com/userfiles/file/pemij.pdf
    • http://denki-shonan.com/uploadsfile/gaganiwatuxesunizi.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd44abbab6---18380371454.pdf
    • https://abyway.lv/images/ck_images/files/pazafepe.pdf
    • http://osoboebludo.com/ckfinder/userfiles/files/xalomo.pdf
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210708_070012.pdf
    • http://fantalife.nl/userfiles/file/jisazibu.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160857b43210a3---lemezabezefagivora.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab43c96f0b1---fetugopijexanun.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/t2oio8eg4h3q1ue8akahbl89jc/sitewesot.pdf
    • http://promador.pl/userfiles/file/96609104398.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=air+salon+and+blow+dry+bar
    • 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_off0000e076.bin
887371b3ff055e044bd2603db00c3b4020f693502af2a7c59bd1212dd01ac897
pdf-font-stream PDF embedded font (sfnt) at offset 0xE076 17208 bytes
font_01_sfnt_off00010d31.bin
c07c89e4d869a6c8f291610caa067ea942534e691a482403353971fb400f14e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D31 10332 bytes
font_02_sfnt_off0001249b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1249B 16792 bytes