Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8fc45646e2b3eb…

MALICIOUS

PDF

74.6 KB Created: 2021-10-07 08:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4a78e6461db7b153181b174c102db2f4 SHA-1: b0449be471c6c2d4fef897495c02bac03703394d SHA-256: 6a8fc45646e2b3ebb5f09d950643d46e051fc2aff44581eb15b49070e289c28c
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614efb9840f04---giluzavuwelimuzovel.pdf In PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/gupoxusidagub.pdfIn PDF document text
    • http://bamor.org/userfiles/file/sagelepero.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4a03086888b2a9ff20aabfc533127b68/26459209399.pdfIn PDF document text
    • http://novena99.com/uploads/files/202110031846524021.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/dudiludibidunimewejonudu.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/42158524773.pdfIn PDF document text
    • http://patroha.hu/file/53593994347.pdfIn PDF document text
    • http://standardamulet.com/files/files/dotofoxotuvutifag.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/65640878410.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/lilozoti.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/gerakunekegiretejoxig.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/mibubafakipotubixofojune.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/94524557200.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/fuxelomaposurufozewirata.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16158fdfb2df58---27455547366.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/powegurana.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158daceb5028---kodekelatitugikulenuzu.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/gogixofibatokewidadesufun.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/j9qfut7l9f5bs30cs6kjpci6pc/mafividevabibux.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/liloz.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/92729008749.pdfIn PDF document text
    • https://edgecs.com/documents/7575943828.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/fuzejotovuwazaf.pdfIn PDF document text
    • http://elskenecologie.nl/files/ralori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=legal+reasoning+and+legal+writing+8th+edition+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_off0000c0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DF 16200 bytes
SHA-256: f55c69f527aec6caefd3b6bc6c93b036a9747b88b94747bb587b36690bc773ec
font_01_sfnt_off0000eaa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 11028 bytes
SHA-256: 4660cd13a79ffc9576bf9c1192d25f6c9d234516956dda866bc9cef27fede3a1
font_02_sfnt_off00010414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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