Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b095688566ee5d…

MALICIOUS

PDF

89.6 KB Created: 2021-07-16 01:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b13e7188d602aad8d33fac9e9f5ef86 SHA-1: 836a0f02e25a465991ce65b9aab55b93efd0f074 SHA-256: 48b095688566ee5dc0cd798fc881eef8ebf62701b224ebf39ae7f60aa07d0b70
156 Risk Score

Malware Insights

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

The sample was identified as malicious by both ML classification and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to websites hosted on compromised CMS uploads or disposable domains. These links are likely intended to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/f5df74c534277afb842d1bcc1518693d/54851698925.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/uv725kgesnvg7m50n2qhcgvr55/67681085429.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/02f08318d2bb966f7bb8cf6286a5a427/xupusewaleditidajelere.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eecccccb5b---67126955109.pdf
    • http://arunimaflavours.com/userfiles/file/78057240410.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f9573d71af5687283ffc2ee517ec01a7/musubupararezaf.pdf
    • http://poltinik.ru/userfiles/file/vekop.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d6b315734be9540425a01848e65ac850/tijoma.pdf
    • http://doubles301.jp/files/ckeditor/files/kitoviruxedixi.pdf
    • http://agisma.ru/files/pages/files/33474017055.pdf
    • http://isystem.hu/ckfinder/userfiles/files/ninez.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/d075d1bd147a7126a0a4b0257b0904e4/pilagosizebepomosegebaxi.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b374570f731---gudufanom.pdf
    • http://energo-winstal.pl/userfiles/file/fugoda.pdf
    • https://avgdesign.com/userfiles/file/kemogoxebu.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/6cb3398b74249530c9239977dee51ba5/73495685625.pdf
    • http://diysmart.net/userfiles/file/8719076631.pdf
    • http://myxroad.com/upload/userfiles/file///85018336382.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/fadeti.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6f198998e---76679944168.pdf
    • http://bsbcarpet.com/userfiles/file/78861085810.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c62a16c469c---gamonofufezijifexotuzilif.pdf
    • https://betenenergy.com/sites/default/files/file/16630176583.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=rick+and+morty+vr
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA69 16792 bytes
font_01_sfnt_off00011280.bin
eb1b30c7d867d0b505b7cea87b5ccaa07d242b79e8c768943c50bf581aede24d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11280 10500 bytes
font_02_sfnt_off00012a69.bin
43a1ba1fec94fb15165bc387eef34243f56cffab8104da2084e47aa7f1e158f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A69 17840 bytes