Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2be1930a42bdf56…

MALICIOUS

PDF

74.4 KB Created: 2021-07-07 11:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 280444357768a814b0c6b5485cbfa278 SHA-1: 4a32849b72ee7e3db9debbf7184bf7c9c84fe77e SHA-256: b2be1930a42bdf568e7c144239d99ac410fdbcfb37198e899aa974025d84d99a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack vector appears to be users clicking on links within the document, leading them to potentially malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d08341b3ed---mubumofojususepiriziji.pdf
    • http://casinodanmarkjackpot.dk/userfiles/file/xurigozafufobiw.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/lmt3j3b336bpuqnj42v3s5f6o1/25532586401.pdf
    • http://jshtextile.com/UserFiles/file///68474480324.pdf
    • http://mbcasc.net/imgs/file/poxuligudake.pdf
    • http://speaklifeiamgreatness.com/files/files/tajuneku.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95b5dc912e---nozilemibavixalofuzenas.pdf
    • http://p-itos.net/admin/userfile/image/file/10722831331.pdf
    • http://kppzp.pl/userfiles/file/33733607478.pdf
    • https://balbok.net/admin/ckfinder/userfiles/files/wakabewizatijovomadunu.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846ca7d34ae---nupan.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/abcb317375b43c08a0cc2cc90bb59a4d/41877896110.pdf
    • http://haohanlegend.com/Uploadfiles/files/20096310914.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5d29a10db---3396167080.pdf
    • https://simondaulte.com/ckfinder/userfiles/files/mazepofusewazeg.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/63296784454.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/888701fef7c87858b5883067654a8e7d/42253573585.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ed566a4b6dc425a04068d43adafb5870/xenomiwilinigegaxovovaga.pdf
    • http://ehomeforeclosure.org/images/file/83769585363.pdf
    • https://govox.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fj9fcn32dplidg6422fadunel/robigema.pdf
    • http://ugyvednok.hu/userfiles/file/livovomi.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ea8f47dc2---lavifejosijomipap.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44800940f0---kavorevesugagofalidiguje.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ever+never+just+already+yet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c26f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC26F 16792 bytes
font_01_sfnt_off0000da86.bin
07c0c86173c741ed6dd8f6389c04254cbceacaf115d02073e7d8fc94e8091d8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 10420 bytes
font_02_sfnt_off0000f24f.bin
21bff890d85ea147b494c0aab87827fa0bd44a910f85e8495f8739cc173cab33
pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 16256 bytes