Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56e3e8c0e275467…

MALICIOUS

PDF

87.3 KB Created: 2021-08-07 05:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 127742a89e31a4b61ea309366fa79ada SHA-1: e0e78a23e37de118888953bb1ada117be25c5e8a SHA-256: d56e3e8c0e2754679c0a3778d097f12580bf9b203060836da48d360fd34004a0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7e018922679472024785816fc2b5fdca/fowolutuzajisafezuda.pdf In PDF document text
    • http://cortabellanews.com/userimages/95265055638.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f2bf212074e0f3e2366cb9eac934aee2/42165244397.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/9236132181.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/57428534705.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a49dbde3b48---90062353165.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/19706607685.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/56604540028.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/11500643206.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/40167470923.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/vijisimikitalijifawa.pdfIn PDF document text
    • http://nessium.net/userfiles/file/4909871915.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa2a8822e---99175834149.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/5smae7k6i8ccrijonp5j85foqo/xatanivoruwidunaxuw.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/repuzev.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/gazuxaxumikotot.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/7912976337.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c6ad7a808ad1b8bf1b56b964e2a6049f/21226114228.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/54147606430.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ed398bd95addac8a700a1c51231ef82e/tugoxikivunibelowis.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16075a490f1faa---14578088655.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d8621d48c---danamipifewa.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c0e69d423ae2c019bf5d3d52119b7150/wozexide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=maquinas+simples+polea+ejemplosPDF link annotation
    • 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_off0000f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 10584 bytes
SHA-256: efad9436644127ec7e055f57cb6f2f70b9ac71dac4ce967436122dbdd67dbe15
font_01_sfnt_off00010fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCF 18000 bytes
SHA-256: 4d2adb3c753e4c2a8c59504515b7dc1689426060e680fa7bb35520d7deee9a92
font_02_sfnt_off00013da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1