Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e73ef4ac8aaba88…

MALICIOUS

PDF

85.8 KB Created: 2021-09-11 06:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 379876ef84d18345d8fb6356f7cb116d SHA-1: 6074921cdbf85d9ca99aa827b43da6ccb54ad5d3 SHA-256: 5e73ef4ac8aaba88b50a10032fb3333f7bca769de68aa27ded71a8bf2a35e24a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous unknown URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://migger.dk/userimages/file/polavanej.pdf In PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/kokozedewux.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/bdccdf045863ec8dbb3109cd4a6ffde4/89106054886.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/wazewopubizipofukeson.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/dotir.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/94441464028.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3159800d9177a65eb77c20d3ed569fc5/kodefibi.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613438afbe11b---kijexan.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/regejenunokabafak.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613548953269f---todabuxijelekamov.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/5ac6d2377dc073c1f88e6be8542a43ca/jadexedekeru.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/27256777887.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/zusanunar.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/jebapugatatof.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/49338485972.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/kebakebite.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/wololiwiwonekofepagixax.pdfIn PDF document text
    • http://marcuspietrek.de/MARCUS/files/file/kilidurokenum.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/38898688983.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/10210381710.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/juxejuvuwarex.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210906143804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=best+calendar+app+for+android+sync+with+facebookPDF 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_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 17580 bytes
SHA-256: abb2702124adfaca4ab90f2afaa22fa5e2164ea53fd8ed61383a122a9adac2c2
font_01_sfnt_off0001173a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173A 11200 bytes
SHA-256: 769017d142316a1e005b56792b5e85d490465d6feb29b4553216108a98c81baf
font_02_sfnt_off00013142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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