Malicious PDF — malware analysis report

Static analysis result for SHA-256 e244e747496d639c…

MALICIOUS

PDF

88.6 KB Created: 2021-07-20 01:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a7ab101379a8bb1a5e0f7de4861a165 SHA-1: 3b841b7ff43e7bbcecb4387638bb9ef7f61fef68 SHA-256: e244e747496d639c5e2a2afa981ac531f3ef2474543caa028f5ff81ae0f14508
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://andrenickels.de/ckfinder/userfiles/files/2331432995.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/9e8e8e8599a3b658a0e25a15224eb37e/64704434602.pdf
    • http://smartpaintingplus.com/userfiles/files/96858881813.pdf
    • http://bitree.net/ckfinder/userfiles/files/68970216502.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f0869e1c712---zenakanemewojo.pdf
    • http://greatnice.club/updatefiles/file/bisixo.pdf
    • http://savannahcentury.info/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/58916351825.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23cc101573---feserorekepirufefutaj.pdf
    • https://actorconseil.com/files/file/4848915393.pdf
    • http://getem.plfiles/file/85431516396.pdf
    • http://ozkayalartrans.com/userfiles/file/48218757491.pdf
    • http://sxcec.org/userfiles/file/20236531229.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/f54b79a449e68e995ff583034bd3d6bc/56545286615.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d86e386b7---sibidavosebutesix.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16075c71a3d996---73806730706.pdf
    • https://laps.pl/userfiles/file/95102330441.pdf
    • https://annjulieskarpmo.com/userfiles/file/83544609085.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/fonetavasonanukarobumap.pdf
    • https://boumqueur-edition.com/upload/fckeditor/file/mizarikun.pdf
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93332431875.pdf
    • http://bigredclassof1960.com/clients/879476/File/riduvopamatenevevuwiw.pdf
    • http://brlairport.com/images/file/memiguromaligidufiju.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/eb41d5b7dd44d96a95d19ca76a10e675/zerowozaloragogike.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/adrpq9q14vmihr3v26l49suom5/gebenikipowojifafinemebej.pdf
    • http://waetsukai.jp/system/ckfinder/userfiles/files/72452220388.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/8109725c675cff8004c5ea3109b3d8f1/61858059117.pdf
    • https://robert-zauer.cz/userfiles/file/6952005686.pdf
    • http://heryeryesil.com/resimlerfiles/56453326285.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=james+and+lange
    • 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_off0000f884.bin
d08de3b7d5f2815f8d057451728a6911bfbee95411f47d8f6405c8182a520b97
pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 17728 bytes
font_01_sfnt_off000126a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126A7 16792 bytes
font_02_sfnt_off00013ebe.bin
127ef81fd8edaf973b272009c62b1068bf1939590a37d44b5755c1981df9fb93
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBE 10172 bytes