Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8681838c6872515…

MALICIOUS

PDF

82.9 KB Created: 2021-09-23 23:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7cafb606588036e95ba5ddea3c1133d9 SHA-1: 7fb5f804dd086a014b2f4286075952c638f77cb9 SHA-256: d8681838c6872515b3c48cb6dc10984b5572c68e1a602279a259b969a8170d6d
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript may be used to further exploit vulnerabilities or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pixomot.ru/uplcv?utm_term=high+graphics+mobile+games+2020
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/18547054025.pdf
    • http://topp.pl/_topp/file/90875159770.pdf
    • http://creatinglifeoptions.com/userfiles/files/19231055972.pdf
    • http://abwmarlboropike.com/uploads/files/dasivopugubosixubugow.pdf
    • http://ivelinabozilova.com/userfiles/file/36619073464.pdf
    • https://thaiahpa.com/flash/files/36961277381.pdf
    • http://alkanboya.com/files/file///kisawefuturomal.pdf
    • http://3e3i.com/UserFiles/file///lufuwijodadutiferoxutamid.pdf
    • http://yeongwonenc.com/userfiles/file/28298667744.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1614b90f87da63---73364778095.pdf
    • http://domuran.pl/files/file/73882600499.pdf
    • http://bsa-billiard.by/images_from_html_editor/file/61925559266.pdf
    • http://www.darvidproperty.com/news/file/74341757824.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/cjpq9mjr10gjmbesit5q05i2iq/45680446025.pdf
    • http://autoescuelatosal.com/galeria/files/8956441739.pdf
    • http://lindendirect.com/ckfinder/userfiles/files/30922798635.pdf
    • http://olgapolyakova.com/files/files/12374403953.pdf
    • http://www.galiantsolutions.com/emailimages/file/60904323235.pdf
    • http://ever-pioneer.com/upload/files/mukavuzajozumejadere.pdf
    • http://pferdplus.at/sites/pferdplus.at/files/file/48224085324.pdf
    • http://sincaremedicaltour.com/js/upload/fejapominubajodedupuge.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/89f136a90203172dd658722fc3c2db8a/8540007811.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de96.bin
92fcbc4b18d476c55d9f95e4fc205039076b8a04b027948dbea3c6eaa8e90a8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 17828 bytes
font_01_sfnt_off00010cda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDA 16792 bytes
font_02_sfnt_off000124f1.bin
6d5266ef39a24071b68e0a36d26a164ba2eb0cfa39a546b6061c5c0b3aa39b98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124F1 10992 bytes

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