Malicious PDF — malware analysis report

Static analysis result for SHA-256 665930bc2974ca09…

MALICIOUS

PDF

99.4 KB Created: 2021-06-10 16:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6401136c18e384a98ec4c9222eefbdc SHA-1: 3169eac041043a3825d85116eb7534def003b857 SHA-256: 665930bc2974ca0919aafc07f06fa0712323a1bca281f7f2d98437857141bff9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body's mention of "plants vs zombies unlimited sun hack" serves as a lure to entice users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://wastran.ru/uplcv?utm_term=plants+vs+zombies+unlimited+sun+hack
    • http://akinmedical.com/uploads/file/96533576514.pdf
    • http://bienbao.org/uploads/files/sevitibelapu.pdf
    • http://dynamic1984.com/user_file/file/zisinatarumagesu.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecea0174d---vigezinomejomirimafe.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/a6bmhv72d2rh505733sorpls1g/bamejubixotusul.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b799ad4cfc26f2307f812f85d0a869a0/vigiwofepo.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4c6ea783b---65592033934.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/qk44e70v75i59rt4hpngm0tivf/49789543606.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3bb7cb1f0---wujetitofawebus.pdf
    • http://oryginalnedekoracje.pl/userfiles/file/nideguzabafabunebides.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/tho0898a4eocrharu9lqpshcs7/lomusixuwuwotinagor.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075b84d6206a---timir.pdf
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/77938796920.pdf
    • https://samowar.ch/upload/file/kenazabejenokivazamu.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2570838ef---maromuxutowinozi.pdf
    • http://nessium.fr/userfiles/file/vuxiwalejoju.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e00d62746---39411616269.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013cca.bin
cc4b3c207eb377f9a8890af1c627a1dc15ae05137ab8a8e7e7e0da8a5eab057f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCA 5396 bytes
font_01_sfnt_off00014f06.bin
bafcfd1afab53a3f4678d1246fd71a846553f840a222806fad580a24350d2e76
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F06 1892 bytes
font_02_sfnt_off00015824.bin
fc9f6db469ef4129717574bdf0a8632ee486fe78291b3b8356c78d70c2dc65e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x15824 11748 bytes