Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3b6b1cf92301db…

MALICIOUS

PDF

82.6 KB Created: 2021-08-14 22:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e3f66f7f3dbf2b0c27f6c303f6edebac SHA-1: 58dc920a95495d4421c9dda43a456681710336b1 SHA-256: be3b6b1cf92301dbb3e224bd927956de37eaeaf243c1a3bf41c2341de16408a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards a spearphishing attachment as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://henca.com/files/details/file/lunidagewomuzonolujitore.pdf In PDF document text
    • http://zenobiacultura.it/userfiles/file///63808496901.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/7563892629.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8ddb454cf---93183385178.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078514e24f2b---xojol.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f69ac81806600da27bed1214abffa3ac/dipelufejeta.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d4757c1ea---33081315541.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/fapirerotuzufekitawaj.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/20084896974.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/ludege.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/63342958181.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/94917923182.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/sofojabetanixereluwabo.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/jaxusezowujiwine.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e6c39bda8faf0b93b69a0a4136c2e26f/jorojanopabezifuliko.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/ullibb2ol13398ju3c9mg4t6t3/garagi.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73d82ac9b3---49441366223.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/d259ffaaea325950cf62b4f3477eb547/butuvi.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/memubozaruginopifi.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/8ujbpuo9d0ud0q9obcnkv4njgs/zereronemonoli.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/951920674.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942d7c183ad---98605342050.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22f2c9dc37---33951381112.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/denugodegiwugijivup.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/kujevenovixitebisef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=divergente+pelicula+completa+en+espa%C3%B1ol+youtubePDF 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_off0000daae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAE 11344 bytes
SHA-256: 1d528a2eb8a44e54762f883b86bcfc611b451e57b968f1ac8821d23fa253fd67
font_01_sfnt_off0000f4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 17608 bytes
SHA-256: cab7013c4a356c7462d13b9a4517e2e0d450d76d320ba7cd2ba307fd36c1ee94
font_02_sfnt_off000121e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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