Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88d8b4b0d237587…

MALICIOUS

PDF

88.3 KB Created: 2021-08-01 12:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 090e5a2c313045d4e4c63aa5fc09a1c9 SHA-1: f722cbcf8f4cf311205dec093d1166815cf8e2d2 SHA-256: e88d8b4b0d237587050c506e92950b09aaf719383981272114ac82b73b49283a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=kia+stinger+gt+custom+parts PDF link annotation
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fabfb3a30---47448927280.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0d99l75cb5c37v42abtkf47133/semalinukirexax.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/73340014587.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/bb06dbc900d22d20195932d9c1c8c0ba/27938873679.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9a4f7aaa2---namigonebusemojadiraka.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/bawosexe.pdfIn PDF document text
    • http://centrons.com/uploaded/file/90649207060cb09c74a0d4.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090385c6cd0b---39416699093.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607559a969e93---47308760622.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/riligitigelav.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160be246154149---mibulatozubisulonus.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ba675f0a5---dexof.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/37a8b7786bf9c33eff40c2ae163343fa/98673396315.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983eaa07310---vipetovugesanabifi.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/cf3d2275fcb314923ac1bea1907ec394/48073671836.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210625191757_757193208.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072025701a07---mipametexiwavuzib.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/49871508859.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ff4151227b2---65501735926.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/67682055670.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/67244760430.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/55756867982.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/wotoxogewolidinokete.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/94236644570.pdfIn PDF document text
    • 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_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC7 10764 bytes
SHA-256: 64664698258389fa1993758fd8a492d0277f7ecb7d4a29c4a26d1f726450d0b8
font_02_sfnt_off0001248f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248F 17832 bytes
SHA-256: a25a83154c357ba185346c8ddf765049ea5927d44edbc11ff51b6c5d8b6f1bf9

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