Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d4dd9c41d58db3…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 18:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bca11929c3a78203869711d91f69e5b3 SHA-1: 6826d11d509e49fff015528dee0205ffca3405a4 SHA-256: 13d4dd9c41d58db3db0820dbb0fef01c206a0b64e04eec6572832bfa49638d80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links and the overall detection suggest an attempt to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://binhchuachay.info/Images_upload/files/22729960464.pdf In PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/nusonikufisinatebufuvini.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161397eb4e3540---11453144823.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/woduloxagenotu.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/wolifixirifovubomerewaj.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/fuselive.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613051bedff60---xulufeve.pdfIn PDF document text
    • http://tochuchoinghi.org/files/luraruguborofe.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/181658865bfda5527769004889515abc/99539369582.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/61254119723.pdfIn PDF document text
    • https://avflash.nl/upload/files/28016071139.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/zukejumoso.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/wewidididigawa.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/kusuvaramurosukasijije.pdfIn PDF document text
    • https://rafautama.com/uploads/file/46333803084.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/gawodovefixuseguxa.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/32414508278.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/75514271331.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/11722456544.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/69190307608.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/86418634725.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/87655374954.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/f0add87c377dfdeec27216328f561367/70127775366.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/deden.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+liberty+city+stories+psp+romPDF 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_off0000d623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 10724 bytes
SHA-256: 9391cb5c66ea7a395740a5c994ee51c788da174bff807013254c524d25e9abed
font_01_sfnt_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 17712 bytes
SHA-256: 2d67ba261b7f479e87ff2cbcc1cacf6ba8ef94a1d468017e16f70e98c7ec5049
font_02_sfnt_off00011cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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