Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4451e60f5e7a8d…

MALICIOUS

PDF

77.4 KB Created: 2021-09-10 14:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 92fea993b0dd3c1249ebde23df8c374f SHA-1: 487c33da661cc0917d6f1e1a822c35baabbd195e SHA-256: 9d4451e60f5e7a8db41cf157b3288819d58d1a697e5033ea87a2424242a125cc
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs, many hosted on compromised or disposable domains, suggests the document is designed to redirect users to malicious sites or download further payloads. The 'Download Button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.
  • 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.
  • 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://cructi.ru/uplcv?utm_term=suge+anime+apk+download PDF link annotation
    • http://botosani.ro/img/uploads/file/5130394514.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/77273347914.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6ebf301f11c49a2a71928d4041a0f07/dunamujifozijemekubive.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/38474870273.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/fb396d282b8c4a1301b23e6da8bb90e7/jaforilez.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/42675773863.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/rumol.pdfIn PDF document text
    • http://bastola.org/userfiles/file/gadefopuwomirilukimovewa.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/ravudirog.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/56699968507.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/wogimojifebinenafurimoxaj.pdfIn PDF document text
    • http://imoroz.by/upload/file/10946855675.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/98332714281.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/45065323831.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///zozewokeviwavaromitabole.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109060545252500.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/kejipafedobon.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/61050095773.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f74c5ebf9e562aac0d51c8a747663f3e/zetujagaruba.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/saniluv.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/guzevowiliweveziwe.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/41418046547.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/zigozezovagoxam.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/34915899577.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/gawosafapoperikobaduj.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_off0000cd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD39 16432 bytes
SHA-256: 4b52a2bdead72616043974fb29aed582f7318e45aaa929d05c9b475ad45de1cd
font_01_sfnt_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 10724 bytes
SHA-256: fce12863d2d636078f134b900c7b386f1e546ecdf46f683ec9fdb4bd202a09b4
font_02_sfnt_off00011060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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