Malicious PDF — malware analysis report

Static analysis result for SHA-256 b987d6f8d6907e3a…

MALICIOUS

PDF

87.0 KB Created: 2021-09-04 02:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 39a989ae5ca3037c5feea4ad8c5cc352 SHA-1: 3a59e83100d33e1c9e4b1452b632097b98cefe88 SHA-256: b987d6f8d6907e3acae2fe10742e7357b09a9ac90c3fac474ed09902c8cc25b6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised websites hosted on potentially disposable domains. These links are likely part of a phishing or malware distribution scheme, leveraging compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://wastran.ru/uplcv?utm_term=manfaat+pupuk+kandang+sapi+bagi+tanaman+pdf PDF link annotation
    • https://travelworld.ro/userfiles/file/44172118200.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/11376976208.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e55f2ad332---xojixorokelat.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/54909779607.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091c4aad0de0---gusolagasuxa.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/1f561987c6b08463a6a5f8e6087cc3f0/22345514009.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/1c3099a2e83aa3ace40102678fdb5fff/35973119689.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/t42bckrchnup6alv1p0h5q9a4m/zujuvinirime.pdfIn PDF document text
    • http://humanlitech.com/files/files/malulanidirap.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/73260469337.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d73c950bc81---67090483356.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/89508465873.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/85836649241.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609119c38b9fb---dirozevajesone.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/rokovepojanezux.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/18906792886.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161255031b5265---ramukasisuxogemofo.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/zupinigutopeduvovibojotus.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811f1d32383---gufotatuf.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/72528194205.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104d7b7cd05a---40248221228.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c6e6c6a02a6087f30f0ee19942c4ab0b/34709709269.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/givixawizebesuzosujutixek.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_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 17288 bytes
SHA-256: d90433fba0aa7cc1ddd0e7470b2e0667f1db2dc172db6ea65d69327556107c00
font_02_sfnt_off00013628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13628 10768 bytes
SHA-256: dfb25f6ab833770056084458b08243f893fb17e5e3d433626974951c490906e3

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