Malicious PDF — malware analysis report

Static analysis result for SHA-256 6abe9aacbacd4880…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 15:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 526bbd261db79e726025619dc694dd26 SHA-1: 163a36db85f93369e0cb209b85514caca8e78f43 SHA-256: 6abe9aacbacd488072a0069922f911193f30594fa098ad3eb60518b5f41a83db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/zaxosaxig.pdf In PDF document text
    • https://ptkas.com/kingkong/userfiles/files/mebiwusamobedupimuru.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/645eb9e0dbea6dab8a8efd13442a1a95/sabeledexokuwepamop.pdfIn PDF document text
    • https://temahr.hr/files/49537076380.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/34917337128.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/36831555439.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/17716607691.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/9bb02920b621d059449bbdffe7e5605e/vupimexebono.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/5343722464.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/59967361593.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/lofewabavodowev.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/56715624529.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/sujotila.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfe9d430df---misarepenagixibu.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a2f191ffbc---zazukopawawagejefu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080497563d35---kezopadobawabinil.pdfIn PDF document text
    • http://computerdoki.hu/user/file/47356571853.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/46be7eea13f0a02c9f38e664a86e619e/17963170607.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fa5431366---denumu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7be44283dd---sitezaboxo.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/47966274696.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/tifebovekepaloga.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c5fc4176c---78278147639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=story+mapping+free+pdfPDF 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_off0000dd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2C 17724 bytes
SHA-256: d1e78a6454b4dcd9909d12144872de04560649078b2c275903e89178aee577c4
font_01_sfnt_off00010b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6A 10816 bytes
SHA-256: 8f895f4c2e2631877439af9ff42ddaa852fefadd64b41bd8fe1b0a1a32d1c4d9
font_02_sfnt_off00012434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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