Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac334d8bab066df5…

MALICIOUS

PDF

79.9 KB Created: 2021-09-25 13:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9bd35db87384ccce917c73cd68469b8a SHA-1: afaaecd03621ccedbf3fb4ecc4f655af40b72d7e SHA-256: ac334d8bab066df5c60dd47c08400932784c12c3cd2650a4fe2c17a4ba833a55
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including one that appears to be a lure for a game download. The presence of a link farm on compromised WordPress upload storage suggests an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation and the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=assassin%27s+creed+identity+game+download+free PDF link annotation
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/36762635744.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/totulafilosub.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c86c49baf---60519046730.pdfIn PDF document text
    • http://centronegozi.com/public/51158822162.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/favobalexowufozonimegelo.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/kiweto.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/golegovinan.pdfIn PDF document text
    • http://thaide.org/userfiles/file/tutidepivigivare.pdfIn PDF document text
    • http://metallpress.ru/files/mibaxi.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/93350236e504444b1332a3b6497485bf/welepewapuzagetixavugur.pdfIn PDF document text
    • http://robedecreateur.com/img/files/lolitolufimubes.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/vumonuw.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/josaluselobixisuz.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/miwubarexojob.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/65073474499.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210910040111.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130ce202d33b---23277773025.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/55247552416.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/4cd3e69eec0828500ee8f3c9589aafac/lipulebelugenokironem.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/39331487465.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/gobujedibesivogobu.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/vitepimu.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/jasisobilatofavovonomi.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b16fe39206---bevodorosizexozubesenotin.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE03 22360 bytes
SHA-256: b10f56e831117893c5789e4c4f6ca6003e1d94dd2ac5966f7d0d2b05bc49504b
font_02_sfnt_off000117df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DF 11036 bytes
SHA-256: 40047266a437d84531aac71a9c4c841fb6c34a0790b3c43e4f84562ed0e17d87

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