Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ec59f852fe67f1…

MALICIOUS

PDF

113.4 KB Created: 2021-05-10 09:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2719e3b5cd522ed457e25bd43bc84143 SHA-1: 8fde3c60eebb2b98a7f493330d05b280520904f5 SHA-256: 82ec59f852fe67f1481ccb4808480425bbebf7886b4e350b5e4c1da193d7f227
176 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload storage, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely a phishing or scam lure disguised as a government form. No scripts were extracted, but the embedded URLs and heuristic firings point to a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085f0e395432---8371560477.pdf In PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca13fea47e---pagoxejufarepax.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/5a74d1dd965bbcc542125649a5487a99/17339845794.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/47rbnsggg9dqhb2k0nqi1qoeuf/41009580677.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/0eb23e6bdd637f11d5a8b696235a5328/gawisesudisawa.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ufosb7hf63hltvoounhc18n040/rezalamazomosaxum.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078c13837f33---dokutakaxawogit.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dd0639376---pakoritedokalitulaririz.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/13483313791.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/37161383609.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fed402d78---89210415647.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/kejitir.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/p450kehhe6vfhcfaojc59mtcp2/pinotunapugevotevigi.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa87b15a4---29322181648.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/43308735725.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee8a9329c5---puditapebolixuganefoxuv.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ea8059069---jopojapisofifobumunada.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/lutazodilaxexejufuwirapes.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=coral+gables+building+department+formsPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001423d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423D 1596 bytes
SHA-256: 160c980d51cae34ae5c602e97090f70e65221942a7f92126d2d36edcfb765824
font_01_sfnt_off00014a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A09 4252 bytes
SHA-256: 8ff05c78950701bf8e65c3d9f3d9983ae862ea09582735bedf126796bcf568f2
font_02_sfnt_off00015908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15908 5404 bytes
SHA-256: 636116e74ea3843fcb3fc746c3284026759fc2a014dd70265d5634191a19a497
font_03_sfnt_off00016b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B49 14760 bytes
SHA-256: 630ee0a7b2ad5440410981cae618afc50b4dd52bbb7955c89eac380830157ad2
font_04_sfnt_off00019c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C1D 17164 bytes
SHA-256: 561e871e48cfcacd3581f7c62da8fa7244bec63c0f554d8ad01c0d7cb653ea2d

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