Malicious PDF — malware analysis report

Static analysis result for SHA-256 45bd5157db4e4008…

MALICIOUS

PDF

69.0 KB Created: 2021-09-04 21:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a06bb7f9c475504a61031a088ac2055 SHA-1: 0243efd8300c8353be5201551f989d3790bb5b07 SHA-256: 45bd5157db4e40086b8f1b9056d0a192996e043ecdd2922cb14b2dd8d1a793f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites hosting PDF files. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de693dc52be---55844849692.pdf In PDF document text
    • http://studioriboldi.eu/userfiles/files/92575278708.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/a1f2bd9760e9944bf2dacb963afb3caf/tujivasijopunopotubevizis.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/vozafonobaxileriwek.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7fb24b5b2---51092587162.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/lekusukenixasokovopowux.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16089a823eb986---20302522588.pdfIn PDF document text
    • http://kaies.cn/upfiles/21062100165547258232rhi1.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/31218242505.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/b43364c267f1b729bb85af390ae38bc3/16264144126.pdfIn PDF document text
    • http://myphamasia.net/upload/files/venoxu.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/67417997570.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/422fcea0bf60a8b47742bf100b6edc55/kefipojubogu.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/8b14145d6676c1a2004a03d6a282914e/jeweparokomosatewi.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/55c314c35b6327e8342a5c136c80997e/janotewugomitosik.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/wigeguneluvojuwusopomolum.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61cdf7f4cd---palobividutes.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210717_170244.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/25427436695.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/pefirelenolorositeti.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d56078929d---semuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=dna+replication+pdfPDF 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_off0000b282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA99 10444 bytes
SHA-256: b9f26ca98b3aa7bc03be00d99a2ff25ca86e9708f098f666d2e1bb6f7487f4f8
font_02_sfnt_off0000e253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 14620 bytes
SHA-256: 029a98acc7769f491f6eddce7d130af4da29fbd54bf5a2da5c2e3ec6b8e47c5b

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