Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9a55c7d7c43ba5…

MALICIOUS

PDF

91.8 KB Created: 2021-07-03 05:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4425f23dce02446f96bf7ca459676653 SHA-1: e93753020b7dab2db1cb9b83a78793ee362cc3f5 SHA-256: 5f9a55c7d7c43ba5d7f0060fb67dc32f3d5c7bf6c07d8cf330774d3405bfaa35
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://kameleonhastanc.hu/files/file/18501081525.pdf In PDF document text
    • https://widepolymers.com/userfiles/file/lujilabudewifo.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1622952838.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bbe301587---lujomofuworup.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/mizumusotavamuzap.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/58825962581.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918e74309b6---33999607822.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/28249857561.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/fc682b0c9ee9c3ecd8cd707663a60151/44091440531.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608040a7ac971---78709957065.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa429da291a---62838376780.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/nilifeb.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/wokibuzosuzudogi.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/68094465851.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab210da0bc3---jajixopaxabujamaror.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/96da7072a026d5ba442e3a188026e3e5/fimopezuragisim.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/603e1282259ae2fbb451489954e8879f/41873721250.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608918b741c61---telutiv.pdfIn PDF document text
    • http://fedoro.ru/upload/file/97244900406.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b50c8bc237---pekeselugowetukupulav.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a308b70c4d---28101387944.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/32743932901.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/7nb0du4kftlindk67ohe16h8ms/94321264219.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e08e419cb---sufor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=shin+splints+are+caused+byPDF 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_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF0 16988 bytes
SHA-256: 7b1937b59ee584c3f6a1339a33cf4588baf0f484368052f614c052ee2cbaa808
font_02_sfnt_off00014948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14948 10920 bytes
SHA-256: 10fc8b2e923e3e42272b23739c6e760ed11dc84c3fb6e04f9e176daaaf021ba0