Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ceb0e3dc94b233…

MALICIOUS

PDF

84.8 KB Created: 2021-07-13 06:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 02abe7d5ec54822b0846424dfc53afb2 SHA-1: 77ea4d415d8f072d27c42bf1710040de91f85f6b SHA-256: 28ceb0e3dc94b233a4cd96b1453ecddf3baf59f834207e293a80b04b85c3a27c
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. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages. The primary goal appears to be directing users to potentially compromised or malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/cb8d5cc0e3a9fc3df4441782beb17c12/zetix.pdf In PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d946f43324d---xalagifafilawusuke.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c1220798584---56941884515.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/3957840657.pdfIn PDF document text
    • http://skncn.com/u/files/remasazeroboxajopefamofab.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/5aobbqnipev0u4qkqm8b9b4n60/sixuxowexosidid.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ff77d579b---40668991991.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8c248fd4c---pagotezimiribuzobujuwiruz.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26cae6bfb9---jilomutoxa.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/8dc7ac93189a98c497a840707fc2ef9f/muravixamokakajuxozal.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/9paqnfej9h1vh3jhcejh7ucds0/mizelovixatenojupebuw.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16072600d88144---velidajejave.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4c7hd2g1oshsp6m8vob8i7ujt5/23984043073.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/sonegisijiben.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a75801a23---19795237260.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bf7d86d6c---75165628381.pdfIn PDF document text
    • https://go2germany.ru/files/file/gunokaxon.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/14399007015.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/84383658370.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/kajawexofodaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=questions+and+answers+on+vectorsPDF link annotation
    • 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_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 10628 bytes
SHA-256: f8b67654d1b6ebff2a6fa0d988ae528888267ea0bc3c0faf6f3fc5259c5bd2bf
font_01_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 18700 bytes
SHA-256: 89c02bae2f0e543f9e90dd1c84705b9fb60b3b53c66dccd776b74f2674c21527
font_02_sfnt_off00012c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.