Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec81a1991138ca9…

MALICIOUS

PDF

76.6 KB Created: 2021-09-03 06:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ba3c5b68dac9dbf88094585eadfbdda SHA-1: b07c207cb85405676e6ebefc497b9002b7415086 SHA-256: 7ec81a1991138ca9a8fcef8ece36f8cca180e09332a449e17fdd005bd9903f61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous external PDF files hosted on various domains, many of which appear to be compromised WordPress sites. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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 https://esperanzadeavila.com/fotos/file/kedofifeluvuxawolelorev.pdf In PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/40862545809.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3f8c7d9cb3e7cafe45df22eb6268f251/getodivafesoruvoxariku.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m1ukc04ukea54p9lc7dj6583l0/29743953801.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbf6fe8898---32456385280.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/kategafasumiruwexu.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/detoxanezewo.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fe33b9aa8bc---xaxezokimajovokalixasabu.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/28143947118.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/fumemodegulavum.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/limobatejototudivovi.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/xapafunu.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/buvomerib.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a6040fea---53325657274.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdffb561d1---gepuwaloxikowud.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/nuxaxomi.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/18691350994.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/306b9eb48f4b0904cd8ca7580609a316/13122944188.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/84567418574.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/2927660644.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a325589269d---80689651035.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050115570869.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/a30ed8ed8c9d3cc2e956808a5b390233/tijatakibepasomipodur.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c4e23455defa0626fd4cd1af9886e182/2776172750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=reflexive+pronouns+worksheets+grade+6PDF 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_off0000c398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC398 11436 bytes
SHA-256: 3806ca7466e6e8525bce423f0aafcad24c3e36f04750ee2171038c207da5a23e
font_01_sfnt_off0000de71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 17852 bytes
SHA-256: 8dbfac6ba81742f373a46280ce58b34982ef73f08b9a878b4b79f0def5cb915d
font_02_sfnt_off00010c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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