Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ee3af5bdb5e7a4…

MALICIOUS

PDF

90.7 KB Created: 2021-07-04 23:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a5bc4861e4f4bff5adca0b53296cf6bb SHA-1: 7c032a522f50e6e2151beb4f31569e9a31cdd4fd SHA-256: f7ee3af5bdb5e7a4bbafeed7b0243e2d6e5861735bc2afdf8a4cccac97c6d579
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. These links likely serve as a lure for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/910cd91c551d45b5fa337adc3f68faa8/dapogawowil.pdf In PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/aebd29e28e19d508db2130440bcaad2e/93054991672.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/477f254fd5e547305c07f6a951482700/55015133723.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072a200a05a7---84968292944.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c90f2c5d37123913f8e752e5c267655e/xefesulufalamabik.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd15407b56---13879877389.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a7d113380d9150ee0107eea6715eded3/zolowuxuxegifoja.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075c7f0d5cf7---wevuvidewome.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609154989020e---32212017289.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/1ruqmaa7apa3p17dd2pek1liuf/24875928886.pdfIn PDF document text
    • https://emmaushuis.org/pages/7402062872.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/lotape.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b4f7db24---koxigivikat.pdfIn PDF document text
    • http://banquat.com/userfiles/files/wokepisevemisusizaleseda.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1aaccfb5995b5134c8dac6a191b7f5f0/sazekarulobogobanit.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/dukezupedadobofiniduba.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/43884336944.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/pogitunenaxosebirixafip.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073209f18298---kugidenar.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0329643d2fb0aa913f6fb4ee72db261b/fezepixaweruxix.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/21776963859.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607487111a0db---sedove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bet+on+national+championship+gamePDF 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_off0000fd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001159b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159B 18064 bytes
SHA-256: 479c22d84c438cb30bbc524aac2e1f7751cf8716a37c0108387b92b63cca62c0
font_02_sfnt_off000144ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FF 10776 bytes
SHA-256: a0bcfb21f2783fb9a3265b516b174ccc2e41d0bb0871aff9d401b08dc9f6e3b1

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