Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ea80f32ce71a0f…

MALICIOUS

PDF

72.0 KB Created: 2021-09-06 13:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a8461f51ee4911dcbb8cf356aa9ddc9 SHA-1: 638811ef29d47b90883db710fc8eb7077d357a40 SHA-256: 91ea80f32ce71a0f07f2e76e151a1c387489bf14f4415cfc81424714db5b19e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites hosted on compromised domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document's structure and embedded URLs align with techniques used to lure victims into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/v3v0q3j0av0eg43nk13vjbu5ei/7605602363.pdf In PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67c4e5ac30---51457368866.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/pimibebilajagide.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/39605876855.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/9467510588.pdfIn PDF document text
    • http://emyorganizasyon.com/emy/ckfinder/userfiles/files/latajat.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607963a951330---sozupil.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/c29bf6fd0db5104b81801ddbbda73f5f/pajujepuwuwodatebimijo.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d08a33feb8---nirasag.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48f490882---jibozebapuzetakitedodaxi.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c1g5l8cd896odrudlq2th4j39/wugekiwusulurobakilif.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/miwir.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/jejugoso.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/motamubono.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/55303488763.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/234f487bc2098d2a817ce94dbcf3a52f/samisivaguxo.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/fusemezabilifukokipik.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/kejodetadedujatutuwi.pdfIn PDF document text
    • http://songiadabinhphuoc.com/upload/ck/files/jipejiromidobexobovudafa.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a40feda1495---15156156686.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/hkrbm9o99eml7nj7kepnbgll1j/vadesuwuvupej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=physics+11th+book+pdf+downloadPDF 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_off0000b6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D1 10972 bytes
SHA-256: 33a33ae14d79de3cae7abf584c5e83a4007c2954fdf1407306c8e27c3659ea16
font_01_sfnt_off0000d01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01E 16752 bytes
SHA-256: 251b4c61dfa88333d31a7a22337abb6304ed268bc982714bbe9779da1312efbd
font_02_sfnt_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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