Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b54f4a8f13e383…

MALICIOUS

PDF

86.7 KB Created: 2021-06-30 08:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d3ba02302f242269fd6ac9c4f3883f2 SHA-1: 7d2008da65a7f1dcb59cb7abf4c1661550f2bcf0 SHA-256: 86b54f4a8f13e383de3dec7574a8fbb4f12df593dce7b805d23ff4256a99a258
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious websites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://laborke.ru/uplcv?utm_term=read+the+bible+in+a+year+online
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d096aee3f---16659239882.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fc67a4cc30e8973a3ea86d9e42d3230f/59536929357.pdf
    • https://botorka.ro/userfiles/file/jejokusojusuliwites.pdf
    • http://wsp.pl/userfiles/file/42778489416.pdf
    • http://wabasnb.com/files/fckeditor/file/37545326160b1716160540.pdf
    • http://iwishop.hu/file/vipuzekotinute.pdf
    • https://kildevangen.dk/files/nijutobatowudi.pdf
    • http://architettoangeli.it/userfiles/files/73560720314.pdf
    • https://bojovicsirogojno.com//files/wagiruvawarepunokurofagar.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084409e846f3---5762116471.pdf
    • http://sivam.pl/files/file/fexikemesozaxi.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95fcf19d56---buxapunusaduziw.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/46p605qcjck2obr041fme6pf45/nusokoxufizifejiw.pdf
    • http://kingcraftviet.com/uploads/ckfinder/files/38788482752.pdf
    • http://automsystem.com/UploadFile/file/20210610205931206.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9adf2d95c0690ce7b04b4cbdeb1a29de/75418287382.pdf
    • http://sarljarry.fr/userfiles/file/66075317489.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/be601ed2f758e2eac0dc8afb69ec88d0/xidotiludes.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c1c750848---48844115340.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afdfe9651e5---bexupidedolabofirefava.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b156e1b3a3---10317517040.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/pb9egf13ulue67f8to9nip37rk/zarivawasewopokesazem.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/fiduwuzoluzizubirorofuve.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_off0000f060.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 16792 bytes
font_01_sfnt_off00010872.bin
bf674ae3e23dbd746ae7f546e5b1b2cede733ed52b7c834b0983f82927ef22b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10872 17396 bytes
font_02_sfnt_off000135cd.bin
2d98afe6cc76471a534b61b766597be7e85183b218f85be7c8b5bccbaaecf021
pdf-font-stream PDF embedded font (sfnt) at offset 0x135CD 10476 bytes