Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1819b6fa2c9ceb5…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 09:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 73a8b10729efe45fdced758f5f61e822 SHA-1: fa8fa7da303b9f2a3fbf6ac90cc70edec876634f SHA-256: f1819b6fa2c9ceb52888acd8bad31686b78a3e9d27f8fb1de5e076f06e6878d8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into accessing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607554d636479---1904467296.pdf In PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/fewowomudufes.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/gapidemanexorumugejepa.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bedf3643d---13206407873.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161219f1a0ec9e---jiketajanalirelomesu.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/likolugub.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/xowiwavato.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984163edd30---18311020465.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/32232699260.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/09us5k1pjk7ut9fr69qgaeieti/47122903024.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/rumunodanigavasir.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/81682853477.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/51301130467.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/19377025351.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f67b6c3645e84167386722d4ed03d5b/83773687961.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/27827101124.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d088a8cc0f1123e6f87f98f93e436cfb/fupepozirijuzepi.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d205162b4f---73569171820.pdfIn PDF document text
    • http://consade.com/userfiles/file/bomigakor.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/boruju.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jeeqckilsmn4ev1tgnpjdi028b/42154713096.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/wofatifekupovirasapa.pdfIn PDF document text
    • http://ore-processing.ru/d/files/43791256546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=promariner+protech+1240i+plus+manualPDF 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_off0000dc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 18324 bytes
SHA-256: bc93263664787fbd78107bd96cece16e2930b7cde9b90cf74f69f51308e1eb63
font_02_sfnt_off00012362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12362 11112 bytes
SHA-256: 2d6bf40bcbc4ab6ac4026db79ac716cf4df46b30e085b93534733a42a8271ed6

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