Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3962d594e93bb50…

MALICIOUS

PDF

84.0 KB Created: 2021-06-28 06:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c8eb05b35299fa41e637ef509b16f26 SHA-1: a2bc50e2117b538169fe2cdb1c3929da5df9602d SHA-256: b3962d594e93bb5044b8ebbdc06d678f3bafc24cf9c6b8e2264160a75af4e1cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://smidgel.ru/uplcv?utm_term=sector+theory+pdf
    • https://al-farh-iq.com/upload/userfiles/file/sexufato.pdf
    • https://room12shio4.com/contents//files/pizabukuwasemomemubonuk.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/ec9bff9085755dbe84a36ea2df9d3c07/14862876792.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/94k95f2eqe17hhbp30sem5hjo3/93014439174.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d40daded9---23969068898.pdf
    • https://audit-advisers.com/userfiles/file/toxuwamizoxokokurabozum.pdf
    • http://unipsyclinic.com/userfiles/file/20210610182404.pdf
    • http://mientaytourist.com/uploads/files/biwiketeledudemabuk.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/11ab37ca9bd2c8ec8df2d8080dce274a/kinobivugejidoru.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/9b90920f0c18810557d54c7b54c344d0/3827816931.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/8bb23ee5fc7d61c72caf55f7cca371c2/807195618.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ee5f51da960ffb68e86d562d31f8c792/4517515956.pdf
    • http://thingsantiquesla.com/userfiles/files/xajok.pdf
    • https://calmoinc.com/upload/editor/file/18448955676.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/4glot0tdb8vr9ivlfjegsdojg1/xarefelumapeke.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7da0ea326---wudazujesoni.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9882b688fc---47545994573.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075c4a66bed7---51119479258.pdf
    • http://blueyee.com/upload/file/230904326277.pdf
    • http://bilmatbasim.com/userfiles/file/niwulegibodug.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090df58cdae3---lomoxofebusawa.pdf
    • http://kamnitikamini.si/upload/files/41306887477.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e746.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE746 16792 bytes
font_01_sfnt_off0000ff5d.bin
cd6d65d67149cff969944c8115d492542ca14cd9b7e79dcf048f3450529c7e2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5D 10332 bytes
font_02_sfnt_off000116d4.bin
b64e82b28d8f70b60e134891a84928e112c21b5ba7c57336a94ffa3cd383076c
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D4 17024 bytes