Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ffc55382728efd…

MALICIOUS

PDF

77.0 KB Created: 2021-07-06 14:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: edcf11b4fa536e348f0cd9eb267fb374 SHA-1: 7179e6cc39c240f0d688ee4b563ddd797d6c1f8c SHA-256: a3ffc55382728efd776681b1cc6fcad8809b6f5d2a5e294c04a4b31193cbd2fb
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, many of which host other PDF files. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4279b66ced---bupavelomofes.pdf In PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/m57hkeiocfom1h2dcog0uk088i/zawor.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/6775806860.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ddaae6d67d3266f7367d6472800aaaae/mumunabubibijeketiwimej.pdfIn PDF document text
    • http://vhktn.at/images/content/files/72770144642.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c7d8a9ab1---30671648288.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/o4t7spdov2ie4i0o7uuard2kg7/89153450505.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0cc3c45e---60283780716.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a002079dd64---68380708809.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/8cbd3f107431f2dccc0de893947e7622/42155429186.pdfIn PDF document text
    • https://olterus.net/contents//files/68043240367.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/fv5j52760rmfqdt2q5u4pomi8h/44749640195.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/p9t8mhiagij4luajh6mno897fs/xoratobubotolimariruxepon.pdfIn PDF document text
    • https://hoalavender.net/upload/files/70818813923.pdfIn PDF document text
    • http://abc-tel.ru/data/File/woligeputulukevuziwoseza.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5387_20210524070835.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae502ccb2ed---69290640897.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/3fae5829ba49f3020d82ef76bfcf3f56/45283175453.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/50c1f2347dcca21085f0a888c8c5192d/ziwatoxuretepirumugebiv.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210617203029_afbpdf.pdfIn PDF document text
    • https://mattress-leader.com/media/30974674893.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814f8092fb5---27461970625.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/65969920661.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/ac815a52e5b0a1167a5cabf0d8f5d6ae/pelozikejupewadarumon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=convert+mm3+to+cm3PDF 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_off0000cb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB62 16984 bytes
SHA-256: 6a6e143d03927ffce71756051a1e125a4e108c17321882b7a5fc38a2826fc181
font_01_sfnt_off0000f7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D3 10192 bytes
SHA-256: 2f9b5ffefe311a3efb1db2857968741e35e4f1e7ebb5fc58d2f4299b4c963b38
font_02_sfnt_off00010ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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