Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b0dd16911c8a83…

MALICIOUS

PDF

107.4 KB Created: 2021-09-07 13:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b474a57d45aadd7b60f86bdf9167975 SHA-1: 2771d25ebbee3f872d5ea2167b2f10576d42720c SHA-256: f8b0dd16911c8a83b82ce86841c1d9d86eccfe80f63d7055f7de8b4b9f46cccd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://huntic.ru/uplcv?utm_term=tibetan+empire+pdf PDF link annotation
    • http://ndt-tl.ru/upload/file/2708346405.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/175a381ffc85d4679c871f0350fe3e11/19063164744.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210606_040931.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/0775d9605a6ab979c9cee5e7f19f7c6a/42302891913.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/bidipakanabarewufa.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/32701832800.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9845e8342---83894718264.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/40096929741.pdfIn PDF document text
    • http://araonline.hu/uploads/file/55910312491.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116a0b8ed5ae---zefivalewosilega.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/spemn86vh0arplhcbut0i6hseu/jegomojuxeverituw.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/sibadarozeduwugu.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/41334723052.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/lofasanodubov.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/pidawixasizofeb.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/29742036196.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/6bc8b441595f5d2c5b9daf2cfab3827f/vurisofetig.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dffede485---redefalivigaf.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/63779061568.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098e2aa03878---rorugoruwefomokonuvimed.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a364743c3be---reloziwuji.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/6f0eb5ccea37ec6e73bffa855724c361/tutefere.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_off00013af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF9 20580 bytes
SHA-256: d84d5ced1914e4ce90b4fea01afa09c5c2afb28415237ea90f338a60ad148b7d
font_01_sfnt_off00017103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17103 10428 bytes
SHA-256: 0dfbc2138aa033628bbbf040b50d60e74b0388736881f2729d8ddfbdca1ec60c
font_02_sfnt_off00018859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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