Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f5a30644ffd9ae…

MALICIOUS

PDF

81.2 KB Created: 2021-09-23 00:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9954ff65290597d10e5b5e272bd7d76c SHA-1: 60c6df74b7ca9d82fed17bf2855c2bf1a1436948 SHA-256: d6f5a30644ffd9aed4d60a14e8a06f6c30f5297f57d37f746515a9e69a3adff5
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The heuristic firings suggest the document is designed as a link farm to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://archism.ru/uplcv?utm_term=how+to+share+phone+screen+to+tablet PDF link annotation
    • http://xdata.pl/app/webroot/img/ckf/files/sonilobofazus.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/nodumidukododijif.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/97102129704.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/lozononasatu.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/44351720207.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/32932848928.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d81c268e87---fobimozomedetewozowov.pdfIn PDF document text
    • https://actorconseil.com/files/file/83913369333.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/sabotozazin.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140913ddfda4---21001807244.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/60071317077.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/5480262550.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/fufudorexuxovimaz.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/6fb0cd7ccac2682f6325bed5afedbddb/54422341493.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/79738944361.pdfIn PDF document text
    • https://mandaljeebanking.in/ckfinder/userfiles/files/naperowodovuwavijikaku.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/65076069392.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15829e666---tumagifizivadalalujukot.pdfPDF link annotation
    • http://ativn.com/upload/file/kuxefarulo.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/kubis.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/somixavu.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/veguvonufi.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/zosuxogaxet.pdfIn PDF document text
    • 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_off0000d9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FB 10596 bytes
SHA-256: 0956d4d7fbd461718ae99b2ca6c21069580ff8b7cccc144218d8f6d76c566734
font_01_sfnt_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 17288 bytes
SHA-256: 685e7a10ebfaeaa770daf5606d1ffdf5b1eaec6e188aae8fa5b739a20b92e596
font_02_sfnt_off00011eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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