Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8dedb912553ed68…

MALICIOUS

PDF

88.8 KB Created: 2021-07-26 11:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 51c44dda118b45082ac921f253ba8040 SHA-1: 83ffead81ab3ad9bce82bccf1eb8ba7b616ac921 SHA-256: e8dedb912553ed6816681f8c41e0de90860e2f891f172322685e13ec172e1720
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. It contains a link farm pointing to multiple URLs, many of which are hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of an attempt to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866c3c614b3---35882280104.pdf In PDF document text
    • http://aven.su/userfiles/file/lizotupusazilemet.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/s5pakabu2ljg76jla894q2p652/kajovijewubibep.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/zuxutik.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4bslfh89r35r62geubc6fjhrt2/voned.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f7287d6991af69e82dd71baa59b7d39e/32106958164.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987b4e1f4cf---18709527903.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/39178758528.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20dfd81a06---7734111560.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/jisaxaluzesozafigum.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/48107077282.pdfIn PDF document text
    • http://palami.by/images/file/94743409286.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e75692cfb---poreluwanow.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b95052d5828---kanebubef.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/3c1feb03716cf5888220187c5e63239f/kigexof.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864e7e7f147---34504239751.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/kizozotuxuperinas.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/2b931b4db2267f1360fcbf1cd65c10f1/8022887294.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/riletojejojolekonidibat.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/barozaxosedotalodikimef.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/ziwuk.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/5p4n8pvlut817htvtk430rdfki/mebat.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/64788715025.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/43892463151.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/misexirojamowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cuentos+con+el+valor+del+respeto+para+ni%C3%B1osPDF 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_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10946 10912 bytes
SHA-256: 5420ab605c8be94a2a5f0cf30ce4d4b9a7c57c2c4f9b331f38aa53681f630bf5
font_02_sfnt_off0001227c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 18788 bytes
SHA-256: 8f0ba053e8a6b802d4c01cb5af517af74564fde2fe858327ca8cd5533cdef003

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