Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea014b208a286f5…

MALICIOUS

PDF

83.2 KB Created: 2021-07-06 12:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c7550cb95aae8a0dd4c7682a48b585ab SHA-1: 6f73f9daf61e96282636fa6322db45f57e7d1edd SHA-256: cea014b208a286f56256aba38c30419f28b347894711ab21edb71a5184eb384a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be directing users to external malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://krisoc.ru/uplcv?utm_term=new+york+drivers+license+example PDF link annotation
    • http://belst.by/upload/file/25035244304.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da2e784c86---sirejefimukegipogonir.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/82510468059.pdfIn PDF document text
    • http://tannhatviet.vn/upload/files/35344100870.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/3946upe0onn1h9t7in7bsst8h8/47439657911.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/1ee547a25146bd6d150d9235984151f3/82127349183.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9025400ff45ee0cca8853e9d7e700531/94282636946.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/rc5fuagodjb5s68rd23lek8gc4/lesuzanukopiluxa.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/kupanoxogim.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a159de6d4---32441555858.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/cqu6768mi3tdelb7u2kk46sj9k/tumufekigiwozajudari.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/lekinibutiduwo.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dba1c43fd---96794348883.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/miduwetamofazeme.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/6a24ef0f36d0c69b093c27164107db10/28054454359.pdfIn PDF document text
    • http://prmakeup.com/Image/files/volomarofofew.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/pewofaba.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/89044368281.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/68bbec52516c705e818f7996805cdfb4/76690347842.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a20edd321---77624576884.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/dogonenopapivigepifasov.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b32ab537588---9572926643.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/qnj9tc45gg2muggrgirbsva177/47204620788.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE285 11016 bytes
SHA-256: 631edd2a20cf1a7da7c3aa33a0290905523bd5f4938a714a2493ced14a6f1f09
font_01_sfnt_off0000fc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2B 16756 bytes
SHA-256: 81fe9067d20bd192f38e044f086716581147db338e9ddf6eeeeb1bc2b0fcdf7d
font_02_sfnt_off0001278f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1