Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ee4b77d4fab022…

MALICIOUS

PDF

72.5 KB Created: 2021-06-30 09:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1a8d31ce4e0bbece7ee57d2073d3b068 SHA-1: 0bcb4ceae0937f20f3127268131f76a3b2ebf9a1 SHA-256: 28ee4b77d4fab0228728aafbc221ef1b0cbe20d5dd27a594dad6dea5943c7c7c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995d75a7efd---69032012766.pdf In PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160be443b0c517---44806962400.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/sisol.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893c74110eb---dunifitigomu.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/033e48c0c3cab28040633b4ca081bc44/gisivorixek.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/9bof4ld55s7da3llqbpi2oorj4/givudabedagabaju.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/34aec4bcae5eaa87011453b7298aaa57/6275787391.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b85dbb92242---baligat.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/23427442976.pdfIn PDF document text
    • https://menu2uplus.com/images/file/2933513702.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/7b4f9f89756eede22a665b577c3eef14/xeminopolesugadilivux.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210523135023_250894562.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/bilarokapozigeguwufosi.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16084e18904ba2---sutiletomoxewapizuxizujo.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b0cccace5fe337c8171d417c49bb27d/niwediwutoligasexudid.pdfIn PDF document text
    • http://iphysiology.ru/upload/todubenasomebak.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/xiredevitixujeribuk.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8ce6bd09b---pagano.pdfIn PDF document text
    • https://cecprint.com/images/file/67310664139.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67370be7e---jotalitativanojifevofipu.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/29341263004.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8739495c8---85473678845.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/69756635211.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/ginorizabiduli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=brother+lc+75+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_off0000ba6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6F 16572 bytes
SHA-256: dca992f75eb32c1290cce89e134c68d2e3f10a649f66633d257e2f857acf8465
font_01_sfnt_off0000e4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 10572 bytes
SHA-256: a66a2261f9223c2123a1dc217d8bad2d4915e968de3fa271d708a44de27e5dc4
font_02_sfnt_off0000fcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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