Malicious PDF — malware analysis report

Static analysis result for SHA-256 18856a7ba48d8a67…

MALICIOUS

PDF

85.4 KB Created: 2021-09-20 06:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfcf98c21dea24542b6822cad90bcd32 SHA-1: 11b83760c69fecb5784fe3534d11c355537fc1f7 SHA-256: 18856a7ba48d8a67374770a844edce3c589405baf3f353861f2c5c5e760599e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern appears to be phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/215f13f48a54de9b733802734d9ae27b/nujezugam.pdf
    • https://mb-classic-service.de/userfiles/file/30272217503.pdf
    • https://aqua2go.pl/galeria/file/dosawujupoxe.pdf
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/jefenobozusi.pdf
    • http://wangguanhardware.com/userfiles/file/25830356758.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161408f3c77efc---26708881890.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613115cc0db09---palufe.pdf
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/gojonematu.pdf
    • http://doo-san.com/userfiles/file/20210910145302.pdf
    • http://cichanski.com/Upload/file/54595555934.pdf
    • http://smartdeal.pl/files/upload/files/33656782215.pdf
    • http://wahluenfty.com/userfiles/93652484482.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/sovamujejimalebaruvi.pdf
    • http://agriturismolionsfarm.it/userfiles/files/kewigom.pdf
    • http://ventmetal.ru/userfiles/files/tuxigitaked.pdf
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23144548622.pdf
    • http://aallergy.friend-match.com/upload/files/80218340068.pdf
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/97997625081.pdf
    • https://aarushimukhwas.idealviews.com/userfiles/files/menimupomopijenowaroza.pdf
    • https://fanaf.org/article_ressources/file/podonixufo.pdf
    • http://saddabro.com/userfiles/file/92986553611.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+wifi+icon+arrows
    • 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_off0000e5a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 16792 bytes
font_01_sfnt_off0000fdb8.bin
10c1cc2cd76c1f2e1649632b2632026ca1eb5760cc2f5bb708d51c8f7ee73789		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB8 10260 bytes
font_02_sfnt_off000114f4.bin
3211471be373ce4d03f4d2e691beea1a936eb9e1bba17a11e2b9b74ae64a7079		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 19712 bytes

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