Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c0b3bd12d304ae…

MALICIOUS

PDF

73.3 KB Created: 2021-07-02 20:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f4db1705b2c99ba0aa848e45b7d38159 SHA-1: 4d1f09b93da463f090bc35e88750c34dde4e07b3 SHA-256: 37c0b3bd12d304ae512bafe91653e078053ebced42b4c74f6f84203f3d82f1f4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, likely serving as a distribution point for further malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a8072acde---wagexelegabuxirosomedeni.pdf In PDF document text
    • http://mwflower.com/upimagesfile///9127645497.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ck73ase6jnja247qm0mmr5u1u3/poxurakuvodejufilowewe.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02f2bc25e8---zujorunelalox.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160865ea1e7c49---sulivaragutebefuruniz.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/93247282411.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/32336079824.pdfIn PDF document text
    • http://solidpractise.com/files/userfiles/file/71056621443.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/tubowipiwazaxokow.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/494335552f0b47ff7cb5fb3737cc0f4d/mokemi.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/d36094b4e896d5f8751ea15c3044fe37/ravadad.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/25220419021.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/5122474440d2196298ebb6d163e292e3/7893722242.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e7ab67bd5---16142628111.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/s4nr11h93gsglkljjfj51r62i1/tumujabifi.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/77q3i8spk9md308tra78q769oc/xetisipanep.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/hfva6ghrgs810o1h2bdaq9vucm/zemid.pdfIn PDF document text
    • http://flomojapan.com/upload/files/guxolisowi.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7a40271bf---kawevele.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/dugumemomiwarujinolufu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c75e6651---fiwizuxaduxoxev.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/399495c894c1335c309eed5bc0bee1c7/35161987123.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d9ce87111---tukuzolupiwez.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/31547118715.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/narivaruwibidesimakodusu.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/kovefoveraviv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=find+the+unit+vector+normal+to+the+surface+in+the+direction+away+from+the+originPDF 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_off0000bd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD15 11268 bytes
SHA-256: 23aca0f725e82983a9b0efaceaed8fe0f5007f05846d343714a44eedc92007e5
font_01_sfnt_off0000d733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 15464 bytes
SHA-256: 39e0ea131394ebc486ac66a5cf835552e4652ba702f27626f99a92fff3785802

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