Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93da8dbce38ca4a…

MALICIOUS

PDF

77.7 KB Created: 2021-09-08 05:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ab7518455020097272c9c3ac58415186 SHA-1: ddebd1f3badf1e771ad8f539918602d50851e1cc SHA-256: f93da8dbce38ca4ad3ea03d5eb4fa8452e83dd1712e5bcae825dcd43f43f679b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of 'utm_term' in some URLs suggests a phishing or spam campaign context.

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://ketchas.ru/uplcv?utm_term=muscle+diet+pdf PDF link annotation
    • http://shinies.ru/img/lib/file/pelutamiwa.pdfIn PDF document text
    • http://homeopathyhk.com/files/mokojegaxef.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/kuduzogavanedonotusuxiz.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f76b9ebb17f---31771633858.pdfIn PDF document text
    • https://hgb.se/filer/file/33294778806.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/bcb2b07c05d2af8918e9f3384130c632/55649585454.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/polaja.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/fixirujekis.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/fiperegetarebesuzotefadeb.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/58516201473.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/subosisemamotimupiv.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210907_064440.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983c63b587a---10849259660.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/dovpai1if6s51sjt4ctlvc79u4/nedudedu.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be14e026d3a---rofesupabavirixita.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe18d04e4da235c5baa7e8c260e63047/tirov.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/88750868824.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a018d5edd5---59794472300.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a89fb05b1---77084659593.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/13833831187.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/39135709546.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ffbd0910735d7b15bacd24682f1ef866/fijinogurebuve.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/43744880872.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/64238639813.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4b297facb---veriweze.pdfIn PDF document text
    • 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_off0000cd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0A 17800 bytes
SHA-256: 4e478157c869789239e537fda9dd2353a34bd46f2e3064bd5bc0f9e361200585
font_01_sfnt_off0000fa26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001123d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123D 10220 bytes
SHA-256: 67033f36d6c60ba5af4efd2968862f997b8c8c574e5aa89a8fce4f4399c9098d

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