Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aee7bfffdd0ec4c…

MALICIOUS

PDF

83.0 KB Created: 2021-08-19 09:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5366751201902416b913b3ec07b39a73 SHA-1: 619d0a72eea25c57d482ce67ef4b2ee96435e07b SHA-256: 6aee7bfffdd0ec4ced426f2abbe1983d501bec221ead916a42c92beb02d43705
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs strongly suggest it's part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=es+haya+o+alla PDF link annotation
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/4qtd83b46304kcriks9umvbos0/42020433019.pdfIn PDF document text
    • http://redactron.com/userfiles/file/75224320271.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbd6037f9b---dasavalagowetifabuwegi.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/xumenikuwovexam.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/48954342652.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/xakimiwizudabol.pdfIn PDF document text
    • https://alariel.be/userfiles/file/vofupakolem.pdfIn PDF document text
    • https://lecapsuledigian.it/file/8854072043.pdfIn PDF document text
    • http://cokhisah.com/webroot/img/files/lewid.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160716b0a7adb3---59460097386.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/87295912283.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/49345728950.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820e8a220dc---92721379681.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8191b28559---21150117235.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0537c56d54---wapumataxuzagir.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/1175414600.pdfIn PDF document text
    • http://daydala.com/userfiles/file/jevulo.pdfIn PDF document text
    • http://jonme.net/ckupload/files/50203921859.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852fe92fad0---25309620305.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/93884036524.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/83173121645.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/kezifopadosajapakesije.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/4329135462.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_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 9776 bytes
SHA-256: cde437bddc3c32967cf802943c8a0ef7c5e2468385a6fbc7341389af7bd1e03f
font_01_sfnt_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001111c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111C 17720 bytes
SHA-256: f2a5548898a98f9b7560f4624a193100597031e37eb8847299d45c3688961f26

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