Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e7db2ecfaa1b18…

MALICIOUS

PDF

87.2 KB Created: 2021-08-04 06:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: eb906dcaba4bad33b958c918d6911c31 SHA-1: 81b292f9c33dae807fcb98ef53bab8ed19143276 SHA-256: e5e7db2ecfaa1b18815934708ab5ceef9f9a54d2ea425ce4f224bdfa07472d9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd59c4d62---30080150718.pdf In PDF document text
    • https://2acontractor.it/images/file/wumewabavowiz.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/60598420507.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/49304521610.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/9de1011adbd73804e94efa484e9db2cd/54701478044.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210725_3B6A1760CF1F7F1D.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075b9406ef1f---kupivej.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607804ea06d86---68401003201.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/96887701106.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ef3eca80a---56239137912.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3cece8ea9a6af1573502112c3e791695/vamuxafakisikasurotazu.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/52217328296.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/54728472361.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b68231d77904ebe554d0cb6bfb3770e6/45949560878.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/77431056397.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f30a37aa1f3---67958098439.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/4d9fec97ceb0bf37729c31e159f2ffe6/16917511387.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d7d224314---dawuz.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/gubutixuwip.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/91348476617.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c6277b81567---gekifazojejugoguzabojow.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/nexikakuzeguzukujewizi.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/mufotinebokavedoruk.pdfIn PDF document text
    • https://lecachet.fr/docs/files/notodiriz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+use+my+chefman+air+fryerPDF 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_off0000f0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A4 10848 bytes
SHA-256: 37f8c92fc6abd9af766de83447f1b00b546b454d762af9a839eb1f6c11aa7a2d
font_01_sfnt_off0001098f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 17128 bytes
SHA-256: 0629ea7aa9ea5837380fb9582bfa23a23b19ecc8bcbb56a258d0f92e59f4276c
font_02_sfnt_off00013631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1