Malicious PDF — malware analysis report

Static analysis result for SHA-256 818a28b17395fad8…

MALICIOUS

PDF

109.7 KB Created: 2021-09-06 06:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7828238b209a0d6e3c45132f86741d1a SHA-1: e64cdf63c30156f9f6cfdfce4316a0ed15735f2b SHA-256: 818a28b17395fad80fe2706f4b2a0944beade1583689a1e6df43d7ab44995897
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e22391111---pamuxugipakejuvi.pdf
    • https://manuscripthandler.com/userfiles/file/kifofatirovagidajaki.pdf
    • http://humanitool.ru/userfiles/file/95633627006.pdf
    • https://ap-qatar.com/userfiles/files/66072533397.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/9c0c6951hcapb361dlsujpmqi2/32479781739.pdf
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/danotajid.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774f981eb5a---xupesilafo.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/a894ba1a1ad1c1484436b2a7418f3e9f/51686159646.pdf
    • https://ecosolar-energy.com/piceditor/file/14018839623.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096010f10a85---wovegovejudixudiluburov.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/notamozuvegurebega.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/fe46fb71092aafd436e17ee154de8678/87471212304.pdf
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72135040807.pdf
    • http://tutaylamhet.com/storage/ckfinder/files/52024665966.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/70386d977786c8177534d960f0ecfc53/23053746757.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/r2bkatrvp0o1g9tjmb2cvgdicn/81317769396.pdf
    • http://efuegypt.org/userfiles/file/37429130970.pdf
    • https://itacademyindia.com/ckfinder/userfiles/files/lesilowatipomilejobol.pdf
    • https://ludifrance.fr/userfiles/file/63790039964.pdf
    • https://tosto.cl/ckfinder/userfiles/files/26723099315.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1611014df736db---45307926046.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160992317c04a6---63046486381.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7fac582c9eff2ae4fb70a1ea4d12dc23/95438517398.pdf
    • http://soundspace.eu/Upload/file/jexopixejazezuriw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=prison+school+manga+mega+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c2e.bin
467862017d06b617571091fdd8d4c080579cad393a335715798553627c1cbb65
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2E 23104 bytes
font_01_sfnt_off0001780b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1780B 16792 bytes
font_02_sfnt_off00019022.bin
c7749f1c92967083a5e7abd6ab59f798e239c1a12799a17b08b668d688fefe4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x19022 10972 bytes