Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6bedb3ce9f437c…

MALICIOUS

PDF

70.6 KB Created: 2021-09-02 14:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6c172a7136df3026c12f1374f4cf025f SHA-1: c4971cab8f5a68ba73cdef053b226dcd56abf775 SHA-256: 1a6bedb3ce9f437cc95bd1511145eb7362efd4eaf73c7a934ed767abc1b69a59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites, likely to facilitate phishing or malware distribution. The presence of multiple links to WordPress upload directories and disposable hosting further supports this assessment.

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://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/36dfd9d35714f2d6d5cf83254ce44cb2/76283486594.pdf In PDF document text
    • http://cdmatik.com/uploads/file/32710981944.pdfIn PDF document text
    • http://yilip.net/userData/board/file/85321052092.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/dc7809068d72edf77676e48a2606a7c7/davibakozaranasoru.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/m0hf48bisr49f752r0ijlf9u8m/bifofipedazugebidizorado.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/32867311611182383e24b.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/sefikowe.pdfIn PDF document text
    • https://patc.fr/imagesfile/bikobemufum.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/pubavuribixopagopufuveni.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/79692909644.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/9ecf2c40a04e4a257a0d5c43720051e6/60373394542.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1cf8845d7---bapunonuzelexeja.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/buvuz.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088bf669d0a8---temewininonijojezuvilot.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/perirojeganipati.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ao40k529feg549scph86pp6j87/tixogudel.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/36971215aa81b7806fea742faa8885e7/fifepawotige.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160783e43d7c0c---14235678656.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/83180519725.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/86321927052.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/93487495078.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/62addbd1382829df0e00c1de5a44e56d/tunutokebaritigunetebe.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/85799902749.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/33677445137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=duerr+log+splitter+owners+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_off0000b7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A4 10780 bytes
SHA-256: 715d96b2cb339fcdb76a3d72d4b0afb3274607199c3084c4845bd24b0a13110c
font_01_sfnt_off0000d07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07F 14580 bytes
SHA-256: 1819a4735b2c201e7caf811051b5e313f643c214aca38b13b8a8d7ae98725217
font_02_sfnt_off0000f53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1