Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8eeb8394ffd13f…

MALICIOUS

PDF

97.4 KB Created: 2021-08-15 14:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7357f166bc5edcdc1e8ab97e46c6974b SHA-1: 8ef64ff22600dc880b3a8c73106d73a962d98197 SHA-256: 5e8eeb8394ffd13f130be654abc240bc5642789187f2f984799bf5f614f0bf56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, including those hosted on compromised WordPress sites. The presence of numerous links with 'utm_term' parameters suggests a phishing or SEO poisoning campaign aimed at driving traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwebjor.ru/uplcv?utm_term=how+to+write+a+student+loan+application+letter PDF link annotation
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9b43fa240f93932772d8d27401951ed9/vujukekawikagupelixefasus.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6dfca3090---nevusajerenobudukeludakow.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/89003860955.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/41351533143.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/beduviwonuwuguvez.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/jepiforupimopefovu.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021080184542_1025688264.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/12311532112.pdfIn PDF document text
    • http://goref.ru/files/file/1490634400.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/88066755988.pdfIn PDF document text
    • https://wrd13.com/force/file/kiboj.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/82184174311.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/9e4ca68bc8698d336d907106e4b3355c/zupufunezalexog.pdfIn PDF document text
    • http://fteq.ru/files/file/fugamanofuf.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/71298580291.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e349c0bf0f4---tifaba.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/27806778268.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/nimebilemoriwukidakesimex.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/3d4ce83964d75940a8959756ccc6c181/75948478696.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/36666434592.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/28037223419.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/21733476589.pdfIn PDF document text
    • https://ewt.cz/res/file/radubujixi.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_off00011928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11928 10684 bytes
SHA-256: 235f097888ef9661b9a342b661d06aa6ca1b065e24df8994c5ab41d5cf572165
font_01_sfnt_off000131c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D9 17716 bytes
SHA-256: 51c4d1eb93f45300d914693e9f38fdaf920a79ac52bc189277a5bdd62a8a30a5

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