Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9fb3b01c0f1a3b0…

MALICIOUS

PDF

107.1 KB Created: 2021-07-17 07:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9fe5443b4fbd37ea74a6912773e8b89d SHA-1: bed16862db940003b5b3541170f2757bbd818788 SHA-256: f9fb3b01c0f1a3b0550dcb4ff8db51c10c9a94f1827f2e74c259592ed903647c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely to distribute further malware or engage in phishing. While no scripts were directly extracted, the nature of the link farm suggests it is designed to exploit vulnerabilities or trick users into downloading malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://tantex.org/tantex/tantexuserfiles/file/41393218561.pdf In PDF document text
    • http://xaydungphongphu.com/uploads/files/widetebewetiwexe.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/55347364082.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6fb67dde9---68433436170.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/wiperomavokebupa.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/14847461595.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608938ee70c7d---79702459647.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/48356957747.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/8090348827.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/buxoratodipupalimupobapu.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210507111119.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847be2399ac---wesoxejix.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/gajuxixo.pdfIn PDF document text
    • https://arerp.kr/data/file///lubilota.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/85420960771.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/46141615692.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/nebogixozevoturusaxagaj.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/xuxelipupawetogepuro.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/dd0ea18ad2390788edeaf0f318d8e7c3/vapiserofifa.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/levezugaforagadimuvido.pdfIn PDF document text
    • http://retailcop.ca/files/99652079250.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/qg0iflbh848tqas4foahtlmcq6/nutifokolafoletububuzojeg.pdfIn PDF document text
    • http://atomleasing.ru/media/File/nabowaruru.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f6894c2fb---vogixopivaler.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=country+treasures+antiquesPDF 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_off00013f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F22 18520 bytes
SHA-256: b858229deedf0936ae621bd27256030fc6feb5cc7538660ce9098ef89a98acb2
font_01_sfnt_off0001701c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1701C 10448 bytes
SHA-256: 2fac40d9c8e8c8c3fef8886f58c6378cf9ff4546ca0f28d5c214a7e04902b66c
font_02_sfnt_off00018810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1