Malicious PDF — malware analysis report

Static analysis result for SHA-256 533e7d8d5556a4cb…

MALICIOUS

PDF

87.8 KB Created: 2021-09-05 09:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c0486f89119af29ebe74c6363c134e64 SHA-1: 487753b35315da4dd75e20c92a4b8277e62e6096 SHA-256: 533e7d8d5556a4cbb7de1148ba75fc47b08f519790de43ea2ab5a92f654ddff4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The presence of these links and the overall detection by security tools strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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=debugging+programs+in+java+with+answers+pdf PDF link annotation
    • http://pretaporter-pegah.com/userfiles/file/xazalefe.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3622c4b0a---75038044988.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/fipozoxaso.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/seworawuzomunatekivo.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/18371465722.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/wabitifarotodupe.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/68603142667.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/7079ca575988ce51acdb052a8a18c4f0/bulexibusana.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/10810760564.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/vebamoliwebaxasexale.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/9fdb1829838a80c8266495bdb5a1b9be/97206895465.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/fb39608d52f55aba381c0a7ac837e873/samuw.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/99fb17aeb399e2fef2b7314027a0a5f8/70465543966.pdfIn PDF document text
    • http://futboltotal.net/images/files/92754340883.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wezavu.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/zisolerowenitug.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f008f6abb5---83130029470.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/bafimamuminexamik.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b445dc1bf---zavilikewojevatuvugugad.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160deb0731b7a2---87836344356.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210904014832.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_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 11424 bytes
SHA-256: 9df3d7d1a7e0c139ec33491dae72a06bdb0841fa82c35d3801d069e59915409c
font_02_sfnt_off00011f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F14 19132 bytes
SHA-256: ff751f9487c689127b300b0b2cb01605abc47f8ea7bc0b60513ba1273e22f3b0

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