Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f1134c201e0097…

MALICIOUS

PDF

91.7 KB Created: 2021-08-01 11:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 87c9247d1bfd34fef4a28849c204361b SHA-1: 69bb65f30bedb3beef09aa1ef56a6f06c76389a7 SHA-256: 25f1134c201e00979d248027e48591fe773dbc212296fe2fad7849fc5b650f08
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on multiple compromised websites, directing users to download files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the presence of numerous links to potentially malicious PDF files suggests an attempt to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d21ae1ef8---veterojamikijorixejot.pdf In PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd6e92306---77889536049.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/22e740c1402f9a690ab5360bd3f6200b/ludoxizosefejutozozo.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/debabepajufugeziwu.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/kusunobexetovumejixalil.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/4966680702.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/xegap.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/261a45838bcc15b30a81a82d3614a100/fubedujimu.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/a5bah85p8kjo69hvddi9rnbk5r/pasedomusi.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e89b88a9ff9---domoputa.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/gawunatejogenixozo.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/tajalogamanifuvu.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/64183280530.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072f2388c691---pimegatefekesenazunamawam.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/58221017873.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/1311815647.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/37012242160.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/68502476562.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/30938136577.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/gohbdqv8v32rk95k2pt5ga55k1/kegitenimubowonavi.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ba6fb57831f5d1c934ad7a97d7d9cc24/jarezomelefixu.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/ropiranivojowijelovatalez.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b1b39b88d32c4d69ed211fe184f5acb5/rawokigamep.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/598678fd34f31204c45935dfeb340c31/xaxogurorofala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=why+is+my+cinema+app+not+working+on+firestickPDF 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_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 19908 bytes
SHA-256: ff58481e73fbdc23a8678f48a65fcc368d804123804448a1223e2f43be30f14a
font_01_sfnt_off00012cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F0 11168 bytes
SHA-256: f1ed83702f8dd30d479df309ba425ea586425b0c422997d79bb402030f1245af