Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72c57579cc7a2f0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 05:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4886cd622ebc7883a5bda1cf7dfa835f SHA-1: 40ec805db62f97701717b841ce670f10e384a2fd SHA-256: c72c57579cc7a2f0b64c745aa685c5b0561e74dc95852d8e09a7592e601c4cc3
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, likely to distribute further malicious content or phish for information. The presence of multiple links to WordPress upload directories and the use of 'utm_term' parameters suggest an attempt to leverage SEO or exploit vulnerabilities in content management systems.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://agrilaui.com/userfiles/file/6690775547.pdf
    • http://royalwedding.jp/images/blog/file/jebegofivevejopo.pdf
    • https://maxflowfans.com/userfiles/file/wepamuj.pdf
    • http://alconsprom.ru/ckfinder/userfiles/files/bogopevetefor.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/7c2262503fbe1993e64b123d68dccf00/63968713150.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609847b6e50fc---87665817269.pdf
    • https://dichocungtoi.com/userfiles/file/97124167903.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/r54a0mrlq8fm4obopes615slio/vubaxo.pdf
    • http://www.deep2001.com/images/library/File/61141567320.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/a9e00d95cddfc3a73f128dd4c73c2e29/nelow.pdf
    • http://axiomestates.com/userfiles/file/venakupepibitekogenek.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9357c51ac---movugaxutemubesana.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/f18e4535d8e2f5a9e39864e3b5d84ca9/70138637679.pdf
    • http://avision-italia.com/userfiles/files/zogibopuxaduzode.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/35596730977.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/m1h5rd7cmkujtmnug40ilval8j/gadid.pdf
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/zapaxusapuzaxel.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/5fd99a29ff323a8153b1ac50c98c4aae/ganopodagukeb.pdf
    • http://ms-krmelin.cz/app/webroot/files/files/xajexagoj.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c295e40f1cf---14259803203.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a0bdd6ae---8072183285.pdf
    • http://terrietanaka.com/library/files/60262843820.pdf
    • http://bindashnews.com/userfiles/file/72874456454.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098f7a807e99---tebimabaz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=programing+python+pdf
    • 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_off0000dcb9.bin
a7d074d962db3d303a00ae53aca1c843da24fb5d24b8614208b75d25cd4a8fd5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 10716 bytes
font_01_sfnt_off0000f4e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E8 16792 bytes
font_02_sfnt_off00010cfa.bin
f14d9b2b30c9ac77c7ac1fa25a21af65e765ac0469b8344737348257a516d7b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFA 16916 bytes