Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd48dbf24fbb3a3…

MALICIOUS

PDF

110.6 KB Created: 2021-07-15 20:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 41d0b433fb2ef84a5806f627b4538b91 SHA-1: 11ea394395957ba5758efeaec64b8e6991305c00 SHA-256: 9dd48dbf24fbb3a306bc1e0a1d036863daace9cfa7ba485e7854ac5ad043799e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://queure.ru/uplcv?utm_term=meaning+of+subsumed+in+english PDF link annotation
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b5979dd1---koved.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/s22orjl6osdqtig6himmibletv/bosukefaguxivofip.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210627110041752.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//pofabevegodagomudora.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2a49023278bd469f829248cbc0deb00c/zegezibavonu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079b084474f0---xasotaxopa.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b21c6a1a8---51598535656.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/zedivipasavitip.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/f4e36fa63b800a948740926dd5c92a34/pewiruworina.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160ad83fcb0377---51292224785.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/gixoromavoxisup.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e39d92130f---43284768626.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/r8c38rahjqle8kv90s8sv9n2k6/xigos.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d3c4303a4---53553776974.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc74da94f8---rojotubaj.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/17e1ed17501a978951d82475d3964ef8/92494601821.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/mezesiranuse.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/molidalofiboxe.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/96cb487bee5ae6080907e7c56ca862b7/82905317805.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160925cf3eb039---53986331508.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/kefinijoxajasaxo.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c08e06d07---sekepilewopiko.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/sefezitimiwujudate.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/g0aai6formhvp9druqibmibji1/39503150585.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f32aac869---17139591084.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014c14.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14C14 28720 bytes
SHA-256: cbcf87f94dc0780e371bdb211abff540f8fe27b24d1d8dec5fe6ea41d5eec996
font_00_sfnt_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 26804 bytes
SHA-256: aeb4b7c326cdf2972b4602da94a80370deeac7b9d5aefc0bc1927fada235aaf2
font_01_sfnt_off00013403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18153 4340 bytes
SHA-256: 26a98139b295c7d516063390126be1c67774bb826410765fc9d761c9a2ac5e02
font_04_sfnt_off000191b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191B1 10836 bytes
SHA-256: 760102ec5cdb08d4b39ec6e3538f97b97cd1d1b7158974adcf454e4a589e9029

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