Malicious PDF — malware analysis report

Static analysis result for SHA-256 9124d6ddf7bc8080…

MALICIOUS

PDF

77.4 KB Created: 2021-09-04 07:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e68c24a56014785fa51157bda27b7d2 SHA-1: 3676242d249fe07d87e40bd98ba9fdce5ffc04ef SHA-256: 9124d6ddf7bc8080873f71a06a50971b995e36b3fda83673ae43ded15dbc55e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on distinct, low-reputation hosts, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://babijie.com/upload_fck/file/2021-9-2/20210902220533903585.pdf In PDF document text
    • http://frigotechreina.com/userfiles/files/sizalarukif.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e5491ad15---paluzorijanigigaxanu.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/79382951329.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/12900249896.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210613_B5265EE7953BE665.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/kapozugabovuvazigibetepiw.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af268374b25---zoxitabe.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/senakuwiwetupotebarogodud.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/270a4e7ac53e693f384469e872298423/94356128842.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/49267611000.pdfIn PDF document text
    • http://dogable.de/userfiles/file/nidek.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/wiretixawipegalame.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/78989184711.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/03d2b134c7c40c6708d8dc2d8471c51d/75323612415.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/84014616122.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac04448faf---24700305646.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/fagekabulorimikiridil.pdfIn PDF document text
    • http://msiutilities.biz/documents/geketetevum.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/60598003628.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/37057813890.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/32488863629.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/dd46bcaf1120471780cb62cb6447f70c/bimijujobigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=liderazgo+situacional+ii+pdfPDF 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_off0000c862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC862 18452 bytes
SHA-256: 168900446d8a637cde84c9a79eefb433d6b651f09092a5f005143ceea2fccc7c
font_01_sfnt_off0000f716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2D 10912 bytes
SHA-256: 3b4c822bb3b9348da802cc23f68238b043035ef6789229311abcec523e6af17a

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