Malicious PDF — malware analysis report

Static analysis result for SHA-256 870761670bab6b22…

MALICIOUS

PDF

103.2 KB Created: 2021-07-08 01:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 350e0e4902585ecc5e9d9faf4cd243d4 SHA-1: 0327ff5c22ef8aa5e4c17cde5408b73eae7fc001 SHA-256: 870761670bab6b22bf40ea3b511d29ddfd62cb6e6cb263c96d9c02eaa46c1052
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous URLs that point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

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 https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaee9e8a6bc.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8ed7df24b---17807389609.pdf
    • http://iwilldoit.ru/uploads/files/files/7440863238.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e3570a81f---posuki.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/6368fcd413ea253f44f2f8b259cb5862/pomenilegas.pdf
    • http://www.fonfe.com/uploads/files/59585839177.pdf
    • http://tai-yang.tw/taiyang/upload/file/482806250.pdf
    • https://systematix.pl/userfiles/file/vulatebojabalofu.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/b3819bd523a52de53b87ee28e412e788/60592323899.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a753c80b025---rojosurafavuragidufipof.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/85e46c75440194293bfe3b39f16456f0/zireg.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e47fb4ace0---77364027307.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d65a749f9f2---munubonesavitezobosabix.pdf
    • https://thai-airpark.com/ckfinder/userfiles/files/55872211590.pdf
    • https://bustotoronto.com/userfiles/file/futiku.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fb63a5ae---36110565869.pdf
    • http://momsystem.ru/public/file/46596218899.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16074404c26a96---20216061245.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/88ee1778060cd5095cb9800f05b58c7e/dutije.pdf
    • http://schs1968.com/clients/861610/File/zomaja.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/b2231a35f6393a30f0472bc79866ce78/47436824128.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/4a4cb61124f94f32c98a02f14057a8bd/fotolewape.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/4oo9mis489olldt8m3ies535n1/91511697255.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/7jcerd12uo7flhsashl39m7ao0/wozelapibariwakela.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/24gll465hv916sukscf4ps4qnn/pewimibixepimi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tilefish+in+tagalog
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105a2.bin
cd995502891255dfbcf4afd28e083ab8bfc87dc57603266f4586087dd25ac3fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 16100 bytes
font_01_sfnt_off00011afb.bin
69b9765524ca00e5fe18afd99092bc1a1610e989e8cee8c7619efb53e2697208
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFB 10356 bytes
font_02_sfnt_off00013252.bin
8793ba91568af9d1dd234962b4ce073d9f61b5d995a6a65a5b63b5c524a54cb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13252 4476 bytes
font_03_sfnt_off000142a4.bin
422540689738188637ae9b2384609cf242c18de183290be9a8e41c134c410591
pdf-font-stream PDF embedded font (sfnt) at offset 0x142A4 19920 bytes
font_04_sfnt_off00017548.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17548 16792 bytes