Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72ff6dca912baad…

MALICIOUS

PDF

108.5 KB Created: 2021-09-07 19:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 02b971506dcc2c4ae04fd71fcaaca9be SHA-1: b64b08c2f36ff41346b728394693e22441352c53 SHA-256: b72ff6dca912baad5bdf945b266a65a1d61f5249f3c75490cef61228d5b68432
196 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 and potential trojan delivery attempt. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, likely intended to host a password-protected archive. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests the document's purpose is to trick the user into downloading an encrypted payload, which is then expected to be opened with a provided password, bypassing gateway security. No scripts were extracted, but the presence of numerous URLs on potentially compromised domains supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://sibservis.com/ckfinder/userfiles/files/milelotupogemat.pdf In PDF document text
    • https://nnkcreations.com/userfiles/file/xojawolibixajafi.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/wizugepira.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/67be7cbbba2dde8b553ef417b7d9d8e3/19962858249.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/964faa53d50028c2f599e1fe7a3216e4/61036384155.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7367465450---31266204235.pdfIn PDF document text
    • http://pmmagic.vn/userfiles/file/40514396088.pdfIn PDF document text
    • http://schubert-hh.de/image/file/vufuzoxogafapudupeluputu.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/98438029483.pdfIn PDF document text
    • http://mebco.ru/images/file/sivodinemaba.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/bigixomevufasopuwemetaku.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/jafin.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8d1ltbq46s1kldufujirv12hd4/dovonunijewulenibu.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210818_4316CBF718C8020B.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/98538290089.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/k1ec2aaeoj2uljrdageeqafgf6/95328680321.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/fnjknpjnbjv6j2o9342dtr5u7c/gotedikokosevoti.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc5d40a671b41dfee8475ae920514b03/xiripi.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/gefokexejuxiduvakuro.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34689311583.pdfIn PDF document text
    • http://synergyproperty.com/images/files/kiwidosisesopufap.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d344d3a33---bidizon.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/bivuleworozobigini.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/32074975586.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/68023439538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=scepter+tv+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_off00013f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15786 10396 bytes
SHA-256: c4a16758826ca6d4aaddeb791bd797b58ee7beea83f8c1752f29ebdb997031df
font_02_sfnt_off00016f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F0F 20368 bytes
SHA-256: f8c1247de395bc61cf8a09f21fc5141af7133c3d159db4c2259555bb24aedf1a

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