Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61c209f6571b81a…

MALICIOUS

PDF

95.4 KB Created: 2021-08-14 11:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd0103b8c92d27c891632fdf1e9b3961 SHA-1: ae6a4b98a640ea7d2a53db05c5bd0160c2fdcf3a SHA-256: b61c209f6571b81ab7fb2d7891564208c9a754785e7b3c5dd6f999e03e753c71
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cochleartudaskozpont.hufiles/94094729938.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/52098398515.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba17675c233---jegopubuveduxel.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3a1206b21---45757713428.pdf
    • https://vienhung.com/webroot/img/files/jukifalazazizasodojoj.pdf
    • https://evergreencans.com/userfiles/file/reneniwofiwomilisig.pdf
    • http://unipsyclinic.com/userfiles/file/20210702014510.pdf
    • https://alamansyria.com/userfiles/file/gemafa.pdf
    • https://asthasupermarket.com/userfiles/file/71222490925.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/motureikhaq6o31hphspv74ml4/24037529990.pdf
    • http://halaljones.com/uploads/files/9968305456.pdf
    • http://veronikavilla.hu/userfiles/file/89793559775.pdf
    • http://www.sec-ollivier-associes.fr/www/upload/file/31610373676.pdf
    • https://elsadaulte.com/ckfinder/userfiles/files/zipifa.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/783ef6e7dbdda36efa7bcbc2159301b3/mevexumo.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/87413345331.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c48ef129c---2151550809.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ar8s2muvegk94nv8rdohbtnsm0/80593453467.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16084051419cd9---17711680097.pdf
    • http://ilovehikari.com/uploads/files/fetokurekedibinomi.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e3d56e3a56e90a93a56aecdcfcc620c0/35175857493.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/i9j210ugor3a2pocecbel3u4i0/28797878419.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/7g782a801p93l9pcdakghm6ll2/1210539263.pdf
    • http://hbisan.com/userfiles/file/48338318332.pdf
    • http://mldinsaat.com/image/files/94255892956.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2be562a80---wajubozuwire.pdf
    • http://iwishop.hu/file/denewenoxu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=block+puzzle+game+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ea.bin
3ec53c13c19731d54a809f70907c3cfedde3f163694d22e74207f63de8dd8a51
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EA 10788 bytes
font_01_sfnt_off00010eac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 16792 bytes
font_02_sfnt_off000126be.bin
92c19e756510821fd3ddba193d1c4efdb6cb770c488d44f43e24b7d3f31be2a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x126BE 18036 bytes
font_03_sfnt_off0001567a.bin
2644880ab233eedbeba0fe73eefbb28fa8cbe22ef8e3f75341962a8002dba11c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1567A 17336 bytes