Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3fce270e276a96c…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 14:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: efd391b31a875167b0e72739e97a0d82 SHA-1: ad547b153a1216f9295d81cb2cab94bb70a6b77c SHA-256: e3fce270e276a96c8ee34d269b1a9004e563cfdd87ef5a86ae4770dd82a3d47c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of multiple links pointing to compromised WordPress upload directories and disposable hosting suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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 http://gunjanjain.com/app/webroot/js/uploads/files/72158533052.pdf In PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/8f2d5c9317d3736e76f40ae79086beba/sidokatipomuviwezu.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/32426230341.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/ziposugaduzotu.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/56317613942.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/86a8782ab44ade791364cab2f6f1b0fa/53976951589.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/tkje2ql4rtrkh5ac67r6rdvbq8/xiwapureki.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/xekolaxafuxonisusenasi.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/lakipusoxawavefojunidaxe.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/56987125920.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096de9d41695---pelodekanajagafetilu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160715edda69d9---89708800838.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d79db524fce---larefabovub.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/856dbc0fae158dd7c33188e31747c720/xoxivigaxu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/lel4f9t1v6j4rj2294mam6bgd5/metilizod.pdfIn PDF document text
    • https://kurtwohndesign.ch/userfiles/files/27010653859.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/q02n8t4mp43gkgf79lhgg25ob3/86939313629.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/kanopeful.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bb347a8e6---bovibadixajugumifafiw.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a625a84819b---mopudu.pdfIn PDF document text
    • https://ubranni.com/uploader/files/51290322617.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/xifekom.pdfIn PDF document text
    • https://groupburuemas2.com/contents//files/nekudokixotipaxatavuwi.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/duziwulogu.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/lejakiged.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=free+knitting+patterns+pdfPDF link annotation
    • 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_off0000e45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC72 10576 bytes
SHA-256: da46288a45f05e2ca55e50a7da917333458a5ba8d86e132fd48f6bf324665ad2
font_02_sfnt_off0001147b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147B 17672 bytes
SHA-256: 6a9f0a3f55a9195ec69f62ac0d07f7898c6969b82f506736b2eee84908d359f4

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