Malicious PDF — malware analysis report

Static analysis result for SHA-256 7624f0e501ae7c26…

MALICIOUS

PDF

84.0 KB Created: 2021-09-21 13:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8bb0d4cdd359256140651defe364250e SHA-1: 6cbe7c81a8a8059aac54f2fd4eb787a8c22935ad SHA-256: 7624f0e501ae7c264e6b22a805d2b17c0896f9bddc8acc13567efebd42de7882
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The presence of multiple external URIs and link farm heuristics points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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 https://inwebjor.ru/uplcv?utm_term=fifa+14+ea+sports+apk PDF link annotation
    • http://songdolandmarkcity.com/userfiles/file/zixififunemevezamotufekin.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/372f8e69288ad87cb0e79c1960f8c97f/9164237325.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/ligunuzukuxelijezij.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210915161157.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/punoku.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/90223730045.pdfIn PDF document text
    • https://energooptima.hu/upload/File/mifixolisub.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/sumaxegitos.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/jogomelijidagopiwujijomag.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zirovuxesetexukowa.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/lozaboretulexivis.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/lenimatokiwegirasamoji.pdfIn PDF document text
    • http://195exim.com/datas/files/perazox.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/14405546088.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/67032240612.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16145fc293f144---56731589234.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/basimimixefojukimuwobu.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/bumuwafu.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/50784593687.pdfIn PDF document text
    • http://mps-india.com/userfiles/files/87429890511.pdfIn PDF document text
    • http://mutitar.com/user_img/files/91406483743.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/zokajejave.pdfIn PDF document text
    • http://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/wotinif.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/196e1bd8e30c7e91cb40a1a65dcfcc21/wafilixonaf.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/47776472600.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/jarapubowo.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_off0000c40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1C 22636 bytes
SHA-256: 98fc6cfa17ceb1c4b599aa48fff34457a702000bc4e53589ee11c1b3dd8cca74
font_02_sfnt_off0001130e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130E 10400 bytes
SHA-256: 36799fbfe0ab9532b69cae7fb1d8b4f8deaf3d947f7cb98e3aef62a75f246a59
font_03_sfnt_off00012ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD1 16432 bytes
SHA-256: 55656dfa70bba26dc65b1ff6caa443c887f9deded9464fda23c400c8a622b0e5

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