Malicious PDF — malware analysis report

Static analysis result for SHA-256 662518f2b0964e74…

MALICIOUS

PDF

203.3 KB Created: 2021-09-07 02:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b2379893fd06bf29bff2be2b8f939e51 SHA-1: 5afe9e1110145b3cdfa2b7798776bcfad12f7791 SHA-256: 662518f2b0964e74456a507ad335fda976a3bbbecb72b3bcdf92516b39b2c0c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized PDF. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of PDF_URI and EMBEDDED_URL heuristics further supports this, indicating the file's primary function is to facilitate access to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

Heuristics 5

  • 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.
  • 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=chess+informant+134+pdf+free+download PDF link annotation
    • http://newkontakt.ru/userfiles/images/file/65134016036.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ee65ed8643dc17813604c7143c678bf4/40265223761.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea56703ebe---simumewomifiwodapasiwuwiv.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16223687571664000451.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/26350556839.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/85928979663.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dce2f70cb01---xoxame.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/vuwowabinogujop.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160f905e836da7---81651002642.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bda2715c3bb---xujeragarumajok.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4170a75a---xumuxofi.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/97763550810.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/6gul5bpo8e9ja38u6r8itqdru3/kolokonelidoxabovatatuji.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/84528685758.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/juzuwetur.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/fuvolavobesofamutexo.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7dd26d7fa---62123078735.pdfIn PDF document text
    • https://saam.vn/images/content/file/wifofekuga.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202108140059583887.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/piponofofavidogix.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/kilov.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002981f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2981F 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_01_sfnt_off0002ad92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AD92 24284 bytes
SHA-256: 00a3ac5a00a1cb057d147c8623fd450c750731ba2e442027a9b47986e5197b06
font_02_sfnt_off0002ec32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00030449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30449 11180 bytes
SHA-256: 17dd5e1ca24a967a02140daecaecd80dd4bfdb40d0ce5049c9adb7fdd4338ca9