Malicious PDF — malware analysis report

Static analysis result for SHA-256 8599e923fa1f13cd…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 19:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 20783b12346968f18692301e51547664 SHA-1: 869b3ce64a4b09ecca4ad0c56a67d112c1e9982d SHA-256: 8599e923fa1f13cd759f24cb1e61bde00a6750c2ad1d4bd71b2c9d81d57ec759
172 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains embedded JavaScript and numerous links to compromised WordPress sites, suggesting an attempt to trick users into downloading malicious content or visiting phishing pages. The presence of a visual download button further supports a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=pdf+split+and+merger+online PDF link annotation
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/11bec8112a63edb4fbdcd914860d1009/zozalipifetudexidetukuxi.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608332aceb7dd---82322300384.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/31779516153.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe68df5c45e---dezaruwisiw.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607975e63513d---jedorub.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/1b7c44f1c8d0f4b805d42e2ff2f72418/kidova.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086956c604d4---kekebomivovurosewuguxofak.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/35321392217.pdfIn PDF document text
    • http://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/39367734793.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/57451930855.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/rovejizilepipelarag.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/74328494145.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d81b2c69d2---rarinalibur.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/f813b11ad46663e89507d3967be1e8f6/fepob.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e16d08a003---60802661587.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/nogumasafofuzudadik.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608edf6000d62---vabisofolelejabuf.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3faf744aa---gererekipabawovesago.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c129cdf0256---2138874128.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/vafulaje.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160cb20bc87a9e---64193503474.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/97853199900.pdfIn PDF document text
    • http://mahnomenalumni.com/clients/879209/File/90776982757.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_off0000e100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE100 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF917 10840 bytes
SHA-256: 589e2b384d600c29e76553701a9d42588b7dfe5608d275ecd1b42299ed5cfdae
font_02_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 17752 bytes
SHA-256: 4bb4132c15a54716ca3371a61cf2a1c1a81888e485451fad019136a4ee197d8b

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