Malicious PDF — malware analysis report

Static analysis result for SHA-256 176011527b07f8b4…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 05:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 00b04d04563b681c3e5356f20d8b1bb2 SHA-1: 9023445da2b800b361b27c1c23b698316a1e13ae SHA-256: 176011527b07f8b43c20afc3a2b95547f6b1676a73889239e1585d0e16e718d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple links to external websites, some of which are hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristic firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/kf2bc62f9dso96tja8ijfnfvu0/86496748965.pdf In PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608863f5d5b62---muderitudivepudelekapad.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612771597d3d5---menireroj.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/fajobibax.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a82c03e325---kuteduvabulomivanapawu.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210814125319.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zajijajagefejadaxezizi.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/pejanavadow.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/33700863048.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/70329532129.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/68154735345.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/guvoje.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/33628662301.pdfIn PDF document text
    • http://kasargod.net/uploads/file/popojusezi.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/5502418473.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/69956028446.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/93766003143.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/tusivuwasakemulo.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609ece9d0eb97---61546001205.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/42817203308.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/21815765427.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/3iajvk9p0trq8dmn1j0f549q8n/41186837605.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/dopogewagumido.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e7532c1c86622ef6a2f7d65718c35703/mulimigul.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/mixisi.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609762c411742---96579880268.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/92372734493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=2014+chevy+sonic+car+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_off0000d9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F6 10952 bytes
SHA-256: cfd94162357684182196a5b766d93479f2da6f6c9b1b307f684d6b84bd79952b
font_01_sfnt_off0000f345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 18420 bytes
SHA-256: 9ea27917fdae13690c1db4cdcb61f488cca0339cf1f8bc5f655cbba5a1e0b691
font_02_sfnt_off000122ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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