Malicious PDF — malware analysis report

Static analysis result for SHA-256 a111ed55836a0395…

MALICIOUS

PDF

85.8 KB Created: 2021-09-03 18:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fdfc06a54ed1f1cd506315c9d9c21cd5 SHA-1: a61df471a71a9036f985b5b08611578681b5faf1 SHA-256: a111ed55836a0395aed7555c0d0978a5dbe068869f42a09b5e2c8242e2e6b2cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress installations, further supports a phishing or malware distribution vector. The primary attack pattern involves luring the user via a malicious attachment to a site that then redirects them to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://naturabliskociebie.pl/userfiles/file/fijubugu.pdf In PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b51c8970d1fa2ff45766e19ba7d816d3/ravobojusonan.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/0766cabb9bef1ebfd732e2eddf1210cb/fojedamipatar.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/sopixosaforevikexotasobap.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/kofapatuforuze.pdfIn PDF document text
    • http://ezibra.pl/upload//file/24651687697.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/83593562965.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/ravurojosonarewi.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/dilunidisoderolozamix.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/97258381258.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/bbac866606a0c845b15bfd8cb13cd0cf/39615524542.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4489514c0685acff54040a0a339e6e69/ketosagakomato.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/14025026215.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3c7be213f---dixerikebajofanakafunuvin.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/waremikanozofepipin.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/pesugodirazirukowinovaga.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160861dc3976f4---44846398356.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/rns8c05f6ttkadelol8vk95nvd/52474330726.pdfIn PDF document text
    • https://kham.vn/userfiles/file/sitapunipib.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/31782773466.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/87835538648.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/b104a68a51a84a3ee70c7665189bc7f5/lipegilaz.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210818222434_452936414.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612e6cd7989b5---68473310444.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161181f588d230---tufinovixakudero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ethiopian+traditional+fermented+food+pdfPDF link annotation
    • https://easyown.ddproperty.com/datas/files/16604425130.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_off0000e961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10178 10580 bytes
SHA-256: 90debdc0fea07a931bb81ecc54084479c64caa30f0c703cc15e7b80b4d8ff6f7
font_02_sfnt_off00011957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11957 18260 bytes
SHA-256: 6b80463d3264567398f5b5a6fe04fda7e7558fae59fa59d0601db950cb57d989

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