Malicious PDF — malware analysis report

Static analysis result for SHA-256 871dde25ff437852…

MALICIOUS

PDF

83.7 KB Created: 2021-09-08 07:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 7a9e9c11e28970c9b5eb50a7adadabec SHA-1: 292fdf40f36378a67ba0aa49c26a6795d68fa4e2 SHA-256: 871dde25ff437852eed9b099e118cdfd5f27c0812c0f03cc2339a38c23072396
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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 http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/b041b35978184cf56f2c6843689a6b92/gejurakun.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a8b9e9d78---39029645398.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc9c75f2457467fb42fb3cd8832bc866/9464739943.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/vuravavizuperup.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/281006219720.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/eb547c078c5e6ab4c78d321dbfae671e/vopuzisisigek.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/rmnk5tgpgmn7brel2qmp1o79me/54960381427.pdfIn PDF document text
    • http://bwc.lt/i/zalapawebib.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/pilojunawufemom.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/dukukikezeralovubisefenux.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kah5f1qrt52ap0sgrah7uohk6s/22216534256.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/sesidol.pdfIn PDF document text
    • http://fittbikese.hu/files/file/2425397871.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c24ce7e37---39887972021.pdfIn PDF document text
    • https://bursajp.com/contents//files/xedurovimimenitifebofalov.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/40367578183.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/1ce5e8985d74d506bec7f41b005fe041/1482279774.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6c3f4f15f9997b00703bf4a22b606f32/zuwexuzi.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/6689010289.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/gorajafumexopejojepeg.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/gunomadofewatawiwogirorir.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/e3441ccc5ed345dd012e7bf852d8d1ce/zilubezixukaf.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/safam.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/nezosotobijuje.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/22603029007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=philips+norelco+shaver+9300+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_off0000df72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF72 18624 bytes
SHA-256: 19f60456b9dfb824d051eff79eec29f5935be3ec030abf5f41a9a0db5c7e7ef2
font_01_sfnt_off00010f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6D 11172 bytes
SHA-256: 4c28175c1ba2c06c6fd0b3c3d3f23a7a06cbca36971fd0eb2dc5c6f9e2c8613a
font_02_sfnt_off0001295b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1