Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b125a27eb065b3…

MALICIOUS

PDF

93.3 KB Created: 2021-07-18 09:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bedf42729208c8b3ba71b1f863ed8ddf SHA-1: 389339ebb9133fbaad1411f5382b4c40c57502dd SHA-256: 57b125a27eb065b3c44583936ac5819c935ce696ef8b283f82fd4baf827dc810
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites and disposable hosting, indicating an attempt to host malicious content or redirect users. The presence of a 'download button' heuristic further supports a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://mya1fc.com/files/ckuploads/files/jifefururopeta.pdf In PDF document text
    • http://maility.pl_adresuserfiles/file/penezabegubodadegijaseren.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/bdf6aae46a109d5fe873d7c689501d50/73889045751.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16074ccb095fb5---gifovejusutotazekex.pdfIn PDF document text
    • http://endemic-capital.com/uploads/files/34416351554.pdfIn PDF document text
    • http://rentaruedas.com/files/others/xufaxemosaliranurad.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/78077259205.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9ced773f4---rapofemuzizum.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/kedapudatefele.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16088d7ef1de27---91817035758.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3427343620---tuleza.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/6600148859.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9990c1ca3---77263822054.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092e08aec4f9---jepopovegisekuwefonazovit.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/55m1km5803o7c4fsjkdjk10rdp/42501590617.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/931ccdf21009b12747a4d5e21ad65de1/vijozuziwisezowukigon.pdfIn PDF document text
    • http://naoshima-habitant.com/1970995428.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/52961131700.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/gumilege.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ced5296221---rizisojujupese.pdfIn PDF document text
    • http://szwygs.com/upload/xafer.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/95458677439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=class+10+all+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000142b9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x142B9 17060 bytes
SHA-256: 7839b1501fad126364d0a912fe1cda4ab272904a4d39c11c711f9afb25028b6c
font_00_sfnt_off0000e25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 10592 bytes
SHA-256: fd1abd81d81be6f25cc5c4dd3767624b31cfbffb129c31d86ddc3fc7562f6cb4
font_01_sfnt_off0000fa92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A4 18472 bytes
SHA-256: 1ceb2bd48c43dbbc71d0815dcefa069d813093a379d8a064d2d238d983623760
font_04_sfnt_off00015b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B9A 2608 bytes
SHA-256: 5a5d72a20528ac197d68dee4454625083f7eb0aa2b7ac3dd60c7370c172032d7

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