Malicious PDF — malware analysis report

Static analysis result for SHA-256 9098f9b2901309a2…

MALICIOUS

PDF

72.7 KB Created: 2021-09-12 02:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 934bb63653a02e34e197aa05210af1cc SHA-1: 950c57c0ff67533b0f6ab6494e58b3b04c265fe4 SHA-256: 9098f9b2901309a201c8b1a824dde0386e4f989a55422e815c50bb3e91b3271b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm on disposable hosting. These links likely serve as lures to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chhattisgarhsanskritboard.in/sharpinstitute/images/files/duledes.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bdb5df523---97559091942.pdfIn PDF document text
    • http://qdjshg.com/files/file/72935157325.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/xosovewokut.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/54263f918fa72cedd0f5d3b6576dad62.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/nabululagobavujemiberas.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/bujoweduvubofufad.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2e5bd573c---pakafavajil.pdfIn PDF document text
    • https://bliznacite.com/files/zekazezijiderutisez.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/3gh309l06njk1viald7lpln606/rebatinus.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/vezawu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376c866eeec---67900655882.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/majinarezuwilijudaxo.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161333a4c2168c---tovokixosujige.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/bibukuzowibofebox.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/ridaje.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/bafukupomivolog.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/48473601254.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/39465428573.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/38359150205.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/3139496187.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0c4a9d5118efa3294fb2eee550041c18/93314611577.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/97711870729.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/20691538357.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/54144504298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=check+serp+keywordPDF 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_off0000bd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3B 10432 bytes
SHA-256: 2b59dd095104c21004202e8da4b3224538f948dc6514d89ff5dc0a5aa6ae5b37
font_01_sfnt_off0000d517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD517 15920 bytes
SHA-256: 5208feb6f5592bb04d3e5ab1153c553b0617a7dd04e18cdaa32101e634d05d13
font_02_sfnt_off0000fdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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