Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e1470a791dba03…

MALICIOUS

PDF

79.2 KB Created: 2021-08-10 07:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 68eff6588919d9cd2c278b11f88d884b SHA-1: 8403c324dd29992769c5ed980b0782365c453a33 SHA-256: 48e1470a791dba030c0c231c347609e47e4e4c79f42319b858fdb497aa0b95b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable domains, designed to lure users into clicking through to malicious content. The presence of multiple external URIs and link farms suggests an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://allytemp.ru/uplcv?utm_term=libro+diagnostico+microbiologico+koneman+pdf+gratis PDF link annotation
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/rokak.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/88627387222.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/pekolojovuw.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/190c5de5b2a2cc17237220529bff8a53/bugekanidobudurotu.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/2193244274.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/vatogozakararal.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/rarepevaponanora.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/tugosozedenaxukumedin.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/kuwukovowepu.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/6f5a930227c0619915515e6ff7499ab1/tixubibukivilupokugo.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/mezamifogufuzasuro.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/risisameruluze.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/15947533226.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/dinonazururen.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0088c069e---12492283075.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1fc1dbb74---9216789795.pdfIn PDF document text
    • http://odumakus.com/uploads/files/60576027429.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5b91606e3---76834196167.pdfIn PDF document text
    • http://tianfonmm.com/d/files/53399525085.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/49463474506.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/58871774906.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610371a4b171a---50426668393.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/48450607571.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB33 11152 bytes
SHA-256: be8b4dc70cac91bd7087fb91284f049ee140976f3ee628453f11d846a76aae08
font_01_sfnt_off0000d4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D5 17412 bytes
SHA-256: 7e5b16cb34962e5eb91a063d8580e7c362de4a15998b16a87e4a9eaf92b73835
font_02_sfnt_off000100f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11907 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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