Malicious PDF — malware analysis report

Static analysis result for SHA-256 920e4422abc33f0e…

MALICIOUS

PDF

78.8 KB Created: 2021-09-22 18:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c60c2fa2549aee5bf78821257279421f SHA-1: 5dca35867f0965b5d63b37fa0e1ec3269e79cb27 SHA-256: 920e4422abc33f0e5755919f957ebafda41f8e701186ee3a99398535b1df54d7
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 ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to distribute links across potentially untrustworthy hosting. The primary attack pattern involves directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://lscapital.it/images/file/janidozoposibejiwimex.pdf In PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e99e3b8c3e---piwugeletogubumegi.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/67110643111.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/14043124716.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/tadikadikoxuvogozepo.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dce6b24e4ee76c3f952b2ffb0316ddc8/42318531113.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/betuledazorozolowiw.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210916_a6727.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/15869337720.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109121428578119.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/kesaxuzexatesijobi.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/gojajajeligikutasaja.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/5rau5rurpqi0taalk4ntd3osjp/wudur.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614997520d35e---daxekel.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/fijenefavuxozonat.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/43426657234.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/lokiga.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/53914734028.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/14144798253.pdfIn PDF document text
    • http://scpt.it/userfiles/files/8743865899.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/88401442423.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/lopol.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/25429369075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=redmi+note+9+pro+max+8+128+price+in+pakistanPDF 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_off0000ca46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA46 18852 bytes
SHA-256: e38a71964ba496d0374a9c7fccb7d5571b52e710446e8dbc443481b8a0b7a733
font_01_sfnt_off0000fac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 11416 bytes
SHA-256: cf85f1d8e6060cf81018703f37c4645b8d54dd2c8176bb593b93f33e144c3641
font_02_sfnt_off000115d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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