Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c8ec2cd6ddeb88…

MALICIOUS

PDF

90.0 KB Created: 2021-06-29 01:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e1e4c52bd7d441963f9da8c983245bf0 SHA-1: 328e9e97ad8855036284d12e355083596b81200c SHA-256: 59c8ec2cd6ddeb886d2ea422daecf1a4786a9fc94223597a890efd19fc0d2a45
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of numerous external URIs and the compromised CMS upload links indicate a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f519a5ba94---76637697937.pdf In PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/fbcf28341e935041cb61c2013728feaa/duwoduxeki.pdfIn PDF document text
    • http://www.heksan.com.pl/file/95456861833.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/7aa882e0e36b5186f4d1bd5c2e34b19f/84986081494.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/9kj7rbu2g4ha5u9i1fp4se2bgl/samugafesisaxinepi.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/41465408719.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/n3kj2oli6tniuh6d91l5oavt36/79602703817.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/89fc2b467ad5cecc970cf68ceef6b016/86326643451.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/mewekijo.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/4263375308.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/gituxazokagixokafo.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f5741e23a---jeduresifulus.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078ce575db0b---mosajukumepuza.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/wunuzilotuvilokubebus.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/89f020bae0a40f45fe55e27a285bc27e/nunibagasotun.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/54532224255.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/fobinorakedenawofudiwo.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d693e1dc9---junuverivovimekanisugo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2114ae3e0ad1704fcb13e7f96aaa96c4/14798623304.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a11f021a3155dc223ecdf242dca208c7/vazidus.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/11391841262.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e22057483---62779360749.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/zadekimuj.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/44168e8321c4ff5bcbc5bb4ada19e9dd/72791183122.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6b12c00d571f35e1564187858d3951c6/61486302379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=as+an+excusePDF 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_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 9952 bytes
SHA-256: 31731d278fc5087988cfe29848ce50fff72cbc1ae3e1fb6fe5933020eff21e7f
font_01_sfnt_off0001127f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 18636 bytes
SHA-256: e73e8172e6ad54c628c0ea17942b3bb821a736fb32e7b765afad35a51389c51b
font_02_sfnt_off000142bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.