Malicious PDF — malware analysis report

Static analysis result for SHA-256 1670efba3343fde8…

MALICIOUS

PDF

82.8 KB Created: 2021-06-28 00:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3b40caa76de0770515fce9e8f4a2a627 SHA-1: ace9bef48da39e48f21bb5facb15ad09bdb88fe8 SHA-256: 1670efba3343fde8f328a92beeab9e58ebeb4bab2cf8d12165ca036771073a49
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised WordPress installations. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089eb38292f3---tuwewonadigitawulizuj.pdf In PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/tawetawe.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/96793100273.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0363df2771---50201215232.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbff92fed1---89304467019.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdbd65938f---21246483946.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb0bec4de3---62962153779.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/10895939785.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3973a970d---rogodakelinemupudefeg.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a69a4be63b9---78061416005.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9de8225694---16275817962.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/bjqsi4gofvjmrl9ighrvpea2si/4301152899.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/55956afaaf91d6071761a00c63cfa584/1831373253.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/83102147274.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/99198704491.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a0cd8b91dc759afc0de68f241ed4658c/ninemojopu.pdfIn PDF document text
    • https://soechi.com/userfiles/file/bipuf.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c21918c7d22---vutuvokovadofufatejux.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffaedb863d---32876756086.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/ii17ujm6j9icf60j25052uuo5a/17217334442.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/039aeb7db81d2ea5825833c9c230fd63/14053906021.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/zonome.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072c2d05c65b---fenomemuled.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967f25cd3b9---sifufibopigisewaba.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/187155c5c2aea7a95d0c1ca9e1b31f2b/37751617557.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/gotugelumexuwirazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=judge+a+book+by+its+cover+meaningPDF 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_off0000dc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC40 11172 bytes
SHA-256: 2ee34a20966760530d64135d6b38b26ac5e4e4436fadf0e045cd717c6d686d40
font_01_sfnt_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4A 18976 bytes
SHA-256: 3e4eaa5d33f339b746b02a8c340f9a4d7af55b404d8a43c413c601ffcdbe5156