Malicious PDF — malware analysis report

Static analysis result for SHA-256 8408244e14382ef3…

MALICIOUS

PDF

88.1 KB Created: 2021-09-05 17:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fe996d29a68b0f1408cba7e46b7bac4a SHA-1: f34a85e2aac7910373d47cf7bb629f2c45622cf0 SHA-256: 8408244e14382ef397677702d84d662caee7877f8d3926e129e68c869d3e1f21
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The primary function appears to be acting as a link farm to redirect users to other sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hzzxtl.com/UploadFile/file/20210808075223799.pdf In PDF document text
    • https://zzarosiscarampola.it/file/supanoremurazuwis.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c1975eaf2---69179704179.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/tedj7iq9rtk31f47v5srtgblb2/wafozoxu.pdfIn PDF document text
    • https://recrut.com/files/files/fejugosivukafelifa.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c140144baf1---18720358939.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/dafidodidutu.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/ruxowajotudigotewinibude.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lemilopolazononokenewaf.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/zinixadosafumamisar.pdfIn PDF document text
    • http://signauction.net/userfiles/file/15990533776.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611154d313b50---mofotomamesoxojevilop.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/96ef78549c0ad0a3662a8d4d1cebe2a8/28730971941.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a65b63981df---niragovufagixug.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/jidosatidutep.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/53311226720.pdfIn PDF document text
    • http://peeweeslearningcenter.org/clients/5/54/545fcf94abc6bccf175f3035c740e6d3/File/visexokafupaserebenagezix.pdfIn PDF document text
    • http://89928386.com/uploads/files/202108290146563410.pdfIn PDF document text
    • http://ledson.ru/upload_picture/66538584185.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/bitukulirasaki.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/89182217560.pdfIn PDF document text
    • https://binhvi.com/upload/files/gomataxiterale.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/55980407474.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/2765673536.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/tazoxegupunijoxobajefud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=atherosclerosis+pdf+2015PDF 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_off0000f405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 10860 bytes
SHA-256: 6407c579f07774c7922e55bc94bb44dc0c7c8176f1f07461ea553e054634e60c
font_01_sfnt_off00010d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001256e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256E 17344 bytes
SHA-256: 3574c0899e3c64fbb0e6e3bed06bb0fd78de37268fd4d2332b1414576d8f6aea

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