Malicious PDF — malware analysis report

Static analysis result for SHA-256 42fcd3faee702bda…

MALICIOUS

PDF

79.5 KB Created: 2021-07-25 08:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6ab3ed70f7cc6c63fed0c0ee6fe6dc7c SHA-1: 776c7fbfc60dfcce1d4a575adbbed8ab0bcfcbc6 SHA-256: 42fcd3faee702bdad03b7912df4d7a32de6bbb03cc685a132aa0c134b04981d3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The PDF structure and embedded links are consistent with a spearphishing attachment used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/885ivgrqth0bc5g6amc1bu8kht/niwazovafokitopaki.pdf In PDF document text
    • http://www.bufolari.com/public/immagini/file/tenikulatarukizulafo.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/63337247143.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/eo3t51ok8dac76ff9cdjairvjg/97528551008.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/sofimofupelawif.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/v3m3s65chkvrglc6omdd1uu81c/jabevuwemazagoweviwiren.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/91f50bd33879babcad779e1a9d928e01.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c5656e54635ccecdda9bd9d8cc691995/dizoson.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82c8302b37---87803083163.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/xogexenutite.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f32abf1356---xilatofuribo.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/bomubi.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf976ea89bf---nibeki.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/63980357379.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/m27nqll8krrt1q3gsh1ncmoh0o/wakinoxinake.pdfIn PDF document text
    • http://sivam.pl/files/file/mubigofogik.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210609054910.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/agjqv193s259e06q698iro0i53/rumotagitozitofi.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/t5njdnmrlsjno07i3oq73dnd23/83970692532.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/vogotifodadufikarati.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160741d7da1ca3---neroxaxusaxuvox.pdfIn PDF document text
    • http://miamiokclassof65.com/clients/d/db/dbefc63a503cf3d3a4f9fb61678ecc08/File/80950421953.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f0d94b3afc94cec89c3d501bd4354ef3/32483932289.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/lijirifelorezuxibixabajub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ser+or+estar+worksheet+answer+keyPDF 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_off0000d3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E2 10436 bytes
SHA-256: bb730fe47768eeb5ffe9fe3deee1d008344ec1ad05a69c793791747a8dd2945b
font_01_sfnt_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B5 17540 bytes
SHA-256: f06f00592e2f6948f7b784cc6a114df594c3a4cbecd150cb6b6c2e9ae3a4fa28

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