Malicious PDF — malware analysis report

Static analysis result for SHA-256 83aadd0e7c13323c…

MALICIOUS

PDF

79.8 KB Created: 2021-09-22 18:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64c787a44b097f31ac2a13514cd15dd9 SHA-1: bfba549dd727a8c17478e90da6f9e462e2bb22aa SHA-256: 83aadd0e7c13323c2f575ea4f475178d78660f5c1ed3ee08c3efb079e0dcbacc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to disposable hosting or compromised CMS uploads, forming a link farm. The presence of these links, combined with a 'download' call-to-action heuristic, suggests the document is designed to trick users into visiting malicious sites or downloading further malware. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=shadow+fight+2+hack+apk+52+max+level+all+boss+skills+unlimited+coins+gems
    • http://elfast.ru/userfiles/file/jikojakixiguwubu.pdf
    • http://cyclad.org/UserFiles/file/kagabosiribufosevemosaxeb.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491d8bc3ef5---95798075212.pdf
    • http://dallard.fr/ressource/site-image/files/zuganif.pdf
    • http://www.ambatownship.com/ckfinder/userfiles/files/waxabuzesisipadok.pdf
    • https://china-glass-mosaic.com/userfiles/files/20210910_183538.pdf
    • http://szguilong.com/userfiles/files/tijilubejuketepuset.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7f7adf2d05ab113da36f1d79db3a4d2c/85655611844.pdf
    • http://mindentudor.hu/userfiles/file/jewabuxakonoligevenulaka.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/ef909758865bfbac694d4ef7f6b00cd3/luratosibinigevexax.pdf
    • https://kapokcmassage.com/uploads/files/202109010921191122.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/b4a6ae788f0be74423dd9e3afcddc112/tojujodela.pdf
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/wozatanixabedarevubokuv.pdf
    • http://dga.gr/ILC/img/file/11090659668.pdf
    • http://jyjwqj.com/uploadfile/file///2021090901462619.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16143f2a9f00b4---19753580609.pdf
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gozipesavojomarawirezusol.pdf
    • https://aqua2go.pl/galeria/file/94055885859.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/818f07db9d1ccabe8b4eb37f52fd1134/86317035556.pdf
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/42365659114.pdf
    • http://kingswaytyres.com/project/kingsway/uploads/file/64379040380.pdf
    • http://yuqiaohome.com/uploads/files/202109220407049283.pdf
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/wudenufilibemedomila.pdf
    • https://5of7edwardstreet.com/assets/media/files/64414994827.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_off0000cf3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3A 16792 bytes
font_01_sfnt_off0000e751.bin
478553518cdd90b7f65ced872b1816936e7cc32d1da021994ab79270c307e9b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE751 11884 bytes
font_02_sfnt_off00010367.bin
be2e0a09564306e361d7314eb73f57f6e8a7ecc3ab1b1387467ee85ea2924234
pdf-font-stream PDF embedded font (sfnt) at offset 0x10367 17624 bytes