Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d81c19a0cdbad1…

MALICIOUS

PDF

85.4 KB Created: 2021-07-20 11:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 137c813362620fbea1ddf7a316ab7c80 SHA-1: 3076871f1254e1bb688d893fbcd2ddc98d512f8b SHA-256: 61d81c19a0cdbad1d491420800220136bcfbc9f8429ded2eed8a95c56cb18d9e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to obscure the ultimate destination, likely a phishing page or a malware download. The ML classifier and ClamAV detection strongly indicate malicious intent, with the latter identifying it as a 'Pdf.Phishing.Trojan'. No scripts were extracted, but the overall pattern points to a malicious document used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/fb348b451f6c6e38e6d363f644390246/juduwazabigim.pdf In PDF document text
    • http://prinsart.ro/uploads/files/kabinesudopabofemabepisi.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/70748087388.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/77930123101.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20215111028409187.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/92247980775.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c4417cab5---80702476013.pdfIn PDF document text
    • http://bociany.sk/media/file/lilirigikofilok.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/e80bb5ec2dd74f9543bb10bf4f792c7d/rifepupofuzavow.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/puzabaxuvowekikux.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e78077b31---68629345476.pdfIn PDF document text
    • https://basisnomor.com/contents//files/fokatudajumadalaxe.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be77af98135---nolubegobawejex.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/25137856525.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/54667912439.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/58882293405.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/9386491910.pdfIn PDF document text
    • http://agrion.org/upload/fichier/kenewinudeg.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e78f4bcecc8---27722556452.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/tf039ejbhu6e751uj0no3632i8/jonunikudisozitojaletevi.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/50773000015.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c85cab4aa71---pudijiwanixenosati.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/vetimufex.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/bumetaj.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608937d5d04a5---xajekexogaronilumojafupeg.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/64096329546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=state+mortgage+and+investment+bankPDF 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_off0000ec1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001042c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042C 17064 bytes
SHA-256: 6384288a8ae95b505d21f9e4fe8c6495431df5aa8c5daa39b9fc328bede2801c
font_02_sfnt_off00013048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13048 10916 bytes
SHA-256: e78c3c4c74e72f683802b541f0cfd132061c09fcb4881aca51291f435e0510f0

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