Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a3e3e41c90105c…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 11:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d88dfd49b509d90d20f9636215077b7 SHA-1: ff5587c48bac42c5c1bcb63fd784584f6c35c05e SHA-256: 75a3e3e41c90105cda13a7b42011de048a81b319c757a5ee5f94a7ebf2d354ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan indicate a likely attempt to lure users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132057dacfc9---kowanisaxowijovi.pdf In PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/f97bc22e5e4b80ff0bc904f7f83401f3/ridemomimosotozumukosif.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b06e3a777ec---zavakesezamux.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160790c42e8966---80479033324.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a947d2696d3---gimuloluke.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/97451072018.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210712092723.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/safijezatofe.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a543546d85d---mogabivusodebod.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be43992eb1a---4826231970.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/eba19f2d0e00c5f258f96fc360d7566c/venanogexibopunipinu.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160710163a6148---vadabanak.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/civoqa6r0nplvpoqc9af3drob0/94684938703.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/gowemogod.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210611060840.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/sonodawokudasikaf.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///vavimiwosuvatu.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/1bdb94385e53bc42ba2b86f95a4f1684/6592592164.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c111af16aa---punuzaxirakukekif.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/45500648570.pdfIn PDF document text
    • https://medtek.vn/storage/file/78859218781.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c779166c56c---86578367868.pdfIn PDF document text
    • http://mybed.tw/uploads//files/202108091123449274.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cebd53109---majediziv.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/24959970044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=wireshark+tcp+lab+solutions+pdfPDF link annotation
    • 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_off0000df47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75E 11044 bytes
SHA-256: fbd9f46d53d31ee9151844bcb08138c27ec0cda29c3fb148d6a8cd913ba9abec
font_02_sfnt_off000110cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CF 17976 bytes
SHA-256: 1dbf26c08210455b1ab32b7409adb424e438cef58cd2e61078d29719c9ce9acd

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