Malicious PDF — malware analysis report

Static analysis result for SHA-256 e627d737fdbd3776…

MALICIOUS

PDF

77.8 KB Created: 2021-09-08 21:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cebfdc9149fb41f53fbc60da199bdf73 SHA-1: 30ef6f312c323d743fa34ec0ee1a60bf4d89048e SHA-256: e627d737fdbd3776bd8c883c935a4c27732e2dccd40f4615300f807dbec3e2be
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. Additionally, numerous external URLs were found, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://nomylo.ru/uplcv?utm_term=backup+mac+to+icloud PDF link annotation
    • https://publicbridge.pl/userfiles/file/3948995414.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/woted.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/1ff1428ff1dc0c45bf7af21d114416b5/wofinaxumazutuxe.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/75332998307.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/kiseganinoxunilakalu.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/26722039751.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/vifodatabodonolajunoxojun.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/siwufipo.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/943356ac45385e5049e395b390090b6b/30503442975.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161326e1cf08d1---45873497702.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353c3bbe0e0---velil.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jiwivotoxakizag.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/savolunetutej.pdfIn PDF document text
    • http://hnht-electromagnet.com/d/files/37498584366.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130a9057b9bc---zabavoze.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d260d44ee---fapudavakof.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/penapesominabot.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/bekoxa.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/tatijujikop.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/10523884743.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/fivuzokafidew.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/15566247881.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebbf801b00---66179130210.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/57553299594.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/74876881196.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/vukatopetada.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_off0000cde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE2 17056 bytes
SHA-256: 66b9aad150f26e9a78d5bb664ab595a1f7a50be88412bde121fa4af5f4efbdea
font_01_sfnt_off0000f9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C2 10416 bytes
SHA-256: 79bfa46554b099d58356c1f5a0828e2d2dfdcc347992e0b097cbd79668ccc813