Malicious PDF — malware analysis report

Static analysis result for SHA-256 0885bafb38632886…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 22:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b76147330df5c1566c69281461858688 SHA-1: 497a7f386a7be95b3f2c83bb14574f01c2899301 SHA-256: 0885bafb386328863eeea5b243deaf5fe1efef0553e12529c848edb153785003
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b109ad61b7---kofuwuke.pdf In PDF document text
    • https://lexcyberia.com/userfiles/files/borexiw.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/botifofuxorasefogov.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609862aac5d61---tawodawagobixepubanikawol.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/muloxurewa.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/kebol.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/vegunuvodibe.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/99235655905.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/dusijemakovozinosi.pdfIn PDF document text
    • https://totounited.com/contents//files/vimogalisipejipuvepokegi.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/15701133002.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/815f13755c0e2c7e299f08deca60684e/lepuduka.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/31456935311.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/63452173017.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/ad168da4aee8fa4e05c9c844f96de4c3/46680612162.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/jakusenupekerilujug.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e7ee17c8bafcfa629352fcad42324282/59200042692.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608151cce645c---84860932237.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/33289432654.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ibanuku.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/64441980160.pdfIn PDF document text
    • http://liily.jp/upload/file/20210814061244.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210629105817378.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/93467184248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=edital+sefaz+sc+2018+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_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 10836 bytes
SHA-256: aeda1c5bf51198be8417eaef6453cd979f80886305fd7e1c23de752c5f84e498
font_01_sfnt_off0000f4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0A 18660 bytes
SHA-256: 6ce26dd6a2dcb2d2f69090f4b99e92daf3c0ff4141b55695fa81bc32c1434e4b

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