Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b992cb50570dfa…

MALICIOUS

PDF

70.2 KB Created: 2021-09-02 11:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8eed078cbb6c8a0021c7477fd5bcaf04 SHA-1: ca1a22ed5cae75aacf874e63cd88c4b5d1f236ce SHA-256: f3b992cb50570dfa99e8be218ff6d3d16b4960e624d92e4a1baacd866234ee4c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to compromised WordPress upload directories and disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=koreksi+albumin+pdf PDF link annotation
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/1nrfdtc04v85tdd9c2qhorup67/kasotebipixujixenepu.pdfIn PDF document text
    • https://miet.hu/kepek/regavitimeviruwisij.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/84378830777.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ac43959f43---1397365540.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/15161775739.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/49523237389.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/muwufitunoz.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210828003137123891cctnz.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/tobitovokuwi.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c950e6041ba---darifu.pdfIn PDF document text
    • https://soft-print.pl/app/webroot/media/files/toladenegiziru.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/67776481354.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78707054757.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/sijaxevoke.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/93772454304.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/50823632049.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a865bac15e0---41555263732.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/45b17f91b2c9b50ce1138a6800812a23/5073905117.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a776d111c08---kadekoga.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbb41a06e9---tefuzomaforilit.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/vuzosirudavuzi.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/66748864096.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe1da315990---tukaz.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/10835702883.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_off0000b3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EA 15336 bytes
SHA-256: 4d3bbfdb22183f752ba05524a5e1a1357eaac1a1597754c60ad8f773886ede1c
font_01_sfnt_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 10884 bytes
SHA-256: 745f2390fea822be0850bd820e3203204bd258d44dd95ac110554cacad571408

Open this report in the interactive analyzer, or submit your own file for analysis.