Malicious PDF — malware analysis report

Static analysis result for SHA-256 bccaf24e850fbcbf…

MALICIOUS

PDF

68.3 KB Created: 2021-09-07 01:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c66d6f1c8c4656dd730fac01d25ada96 SHA-1: 1ae228417cece6e90cc5d155a5e22783ed29da63 SHA-256: bccaf24e850fbcbf5d1427ce30351bbbf4e968c5701592f14ff14f3101f28beb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristic 'PDF_IMAGE_LURE' indicates it's an image-only document with an action trigger, likely a disguised clickable link. Multiple URLs extracted from the document point to compromised CMS uploads and disposable hosting, suggesting a distribution network for malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fabff0dede---91698711930.pdf In PDF document text
    • http://bahattinburyan.com/userfiles/file/memedevibig.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608408dfcba52---nerafufabalagudeseguga.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/labutabuto.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/2f4ce5be527f60925ccf90e9e805bf82/62974313026.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34708007899.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/xojapa.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825fd0a156e---26107989546.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea7d8b8b9---kafujopetodosijofipuj.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085245bc0870---dixukevutakadituzunune.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-29/20210629134806303419.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/jerujel.pdfIn PDF document text
    • http://cosyromania.com/media/file/mixab.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/77b20b24d4055b8b3861d4192fdcc14b/tusetejatunupazak.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adea00c5189---67458561235.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/xogudenabeziluma.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a5b49dc0d26b3c980854a296929bf2fb/modafowalarobavedamufe.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160993b73a2e74---vorotigeguzu.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/68479281527.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/88108949363.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/67652653885.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/36303509030.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/givelabiga.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/52612741576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=kawasaki+ninja+650+abs+manualPDF 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_off0000b0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F1 10780 bytes
SHA-256: 5c7b1991efbb4cc17b1b4c029e536b6772d5c7fe5402e8c6032ebd3821efa204
font_01_sfnt_off0000c9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D6 13708 bytes
SHA-256: 108ff52b49f08e0fb90cf7b41c0561b82939dd1076202107feb5845f1b43e299