Malicious PDF — malware analysis report

Static analysis result for SHA-256 6439d9400dbf7e87…

MALICIOUS

PDF

99.6 KB Created: 2021-06-28 01:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec3fb0e8d8d8bce8061120d3b259c43a SHA-1: aa0c72f1020b8ace7c74f069fd58de2543c5df68 SHA-256: 6439d9400dbf7e87d3378cd743c147b3f6a2dcf37609e1c66aa0374809fb1847
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample contains embedded JavaScript and numerous links to compromised websites, indicating it is designed to exploit users. The 'ADVANCE_FEE_SCAM_LURE' heuristic strongly suggests a phishing or fraud attempt, likely to trick users into downloading a secondary payload or providing sensitive information. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://queure.ru/uplcv?utm_term=minecraft+pe+lucky+block+race+map+download
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5711d30d8f---tizejowobexodanuloro.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/si0vduqrk8hth25gchbvpnhvgv/nuwisirazebokux.pdf
    • http://alessandrobelleseveterinario.eu/userfiles/files/43824147211.pdf
    • https://locoffice.ru/userfiles/file/tevezolu.pdf
    • http://gold-carsales.com/js/upload/files/pagowikexote.pdf
    • http://hongshengfish.com/uploadfiles/20210513/2105130217041387651f8w7sgw6ptz.pdf
    • https://vestol.bg/files/file/7200185434.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/dco08iusmvlljpb0jipo192563/rumokaza.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/t8ve20rhb8h0ak74ec7lfqrs82/91261065979.pdf
    • http://lovelyspa.net/ckfinder/userfiles/files/94275028777.pdf
    • http://billedbutikken.dk/articlefiles/file/fipanotusel.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/69768033756.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/df362ef82daaaf12c5c7d2ed049ff25c/66569458978.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160772c3697944---43594955163.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/5rr8igknc69s1ugk51ed5q4576/bedaf.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608788f99fa64---82544825775.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaf4ac07c0---nevato.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086595f20659---mebisoron.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a0980e8bb---nijodexalifuzopefugiwi.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/wiposavetowa.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cecf43c0d5---49395701336.pdf
    • https://uppersanduskyrotary.com/cms/files/File/7620758945.pdf
    • http://absigorta.come/file/30498529826.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/g7p7eeqbsa6ia3en5ujkenhvgl/56126649656.pdf
    • http://fotografoenricogiampieri.it/userfiles/files/77652716412.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010309.bin
d660263bc5821aba57f5f2be8a89460c59a925e2f40930d9a1155aaca89a16e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 18892 bytes
font_01_sfnt_off000134eb.bin
84c3c09f17f8b7e467b4b896a8d6bf564b5d118657b997c64f5a41d4dfafb1c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134EB 16700 bytes
font_02_sfnt_off00014cd1.bin
e350db17370c771cff3de25065df0b87b5aa59c7da6ac924af211f366386d8bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD1 11136 bytes
font_03_sfnt_off000166a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x166A9 16792 bytes

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