Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d11e4f106de2452…

MALICIOUS

PDF

83.1 KB Created: 2021-08-25 20:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ab38fd4858be904f1eccd6c26ec5fe4 SHA-1: 591241d437c7c604e36c211bcd9f68e99bb42c70 SHA-256: 9d11e4f106de24520846bc2bac2aa797cec6607d9d5a4ecd825c11b47a2b1576
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file exhibits multiple indicators of malicious intent, including a high ML classification and ClamAV detection as a phishing trojan. It functions as a link farm, directing users to various compromised or disposable hosting sites, likely to download further malicious content. The presence of a 'download button' lure and callback phishing pretext reinforces the malicious workflow, aiming to trick users into executing harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://drafthe.ru/uplcv?utm_term=close+to+home+cattery
    • https://chinese-wall.tw/upload/files/97919797688.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/a911184dd1134736048e0bcff9b15a64/fosadawizoje.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098914668aa7---keluboxa.pdf
    • http://hataylezzeti.com/resimler/files/lifaloked.pdf
    • https://t2sc.me/userfiles/10233046296.pdf
    • https://bisnismedsos.com/userfiles/file/42215134353.pdf
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/40797185017.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b21e9ee1---pelenevuxexi.pdf
    • http://hanasushichoice.com/uploads/files/jinuvakesavatuxige.pdf
    • http://rentaruedas.com/files/others/wufuxadewaxeruton.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b161775c4fc---dovasowiraxukivata.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/2ei9p7s7t8f41eebhilhcjpj9f/wesetixedazaloneviga.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0236d0958d---jujebekifufodugamuvibep.pdf
    • https://uclerbaklava.com/resources/file/gikova.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609888beda102---piwufuk.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7423be414---39139244544.pdf
    • http://thestarbusan.net/FileData/ckfinder/files/20210614_A2508AFC14F965F7.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/c2063d096267276761e0d1a300f4b624/mudames.pdf
    • https://bozoklar.org/ckfinder/userfiles/files/52722052775.pdf
    • http://architettoseneca.com/userfiles/files/17213962582.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730f477511e---zupap.pdf
    • http://tbm-mova.by/images_from_html_editor/file/zudexidokural.pdf
    • http://domainecomps.com/documents/files/ludaxamurogojesib.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4fe112710---91696935216.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_off0000e0a8.bin
4e3770e8c624e4fb1f2fdf9dddc4cfda9a7f09c0963fcf9b74d44103a6eb428e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 17320 bytes
font_01_sfnt_off00010e18.bin
5dc6dbf5482a079b609f4911fa06877504fc136222f5042f0c0cc114c462a883		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E18 10444 bytes
font_02_sfnt_off000125eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125EB 16792 bytes

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