Malicious PDF — malware analysis report

Static analysis result for SHA-256 8356b000bf1bb09f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 10:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01d1611ef0bbc35ec5504cfe3cf36ff4 SHA-1: 032f58096612103c3afa32ec8819ec51e38aff60 SHA-256: 8356b000bf1bb09f733733d6277c9ce8494a7d0c256209da4f2d6e816624501a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of a URL with 'utm_term=mlbb+latest+version+free+download' indicates a lure for potentially unwanted software or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=mlbb+latest+version+free+download PDF link annotation
    • http://belloverde.net/emailer/file/35173380715.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/57skncgij1v2h0sunmset7t894/67819481535.pdfIn PDF document text
    • https://cargobull.cz/res/file/sopapiv.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/21740697104.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/fidenusisibabunemupi.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/tipexopemekoxetusowujop.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/xudojuvezefasigatazimoluf.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/61699729228.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5qkagn7rt4d14hh5of34js0d10/35963349212.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/73579358395.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/tigavijenamoxeritaw.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613375fa15464---72572001742.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/dokekesuva.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/28235950331.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/69221353907.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/70256402342.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16134fd5b286e8---26892297317.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/wosuvosuxugo.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/nuvewikuzenuwa.pdfIn PDF document text
    • http://446888.top/userfiles/file/nojolugigofo.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/15829041772.pdfIn PDF document text
    • http://gibisch.com/files/files/zolumozuvek.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_off0000e041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 17844 bytes
SHA-256: 9471a743ebc2dbfbd07580427777e955ed107e9b91f832e3c3fa5c9a3066fe99
font_02_sfnt_off0001264c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264C 10632 bytes
SHA-256: 9943797e6f419d7e334f2a0dbddd0fdf043e52b23e93de8c253850890f0d43ae