Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aaa9d6cd74d2bd2…

MALICIOUS

PDF

82.5 KB Created: 2021-07-24 09:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f9fd9e725c099833eb48b24d89220559 SHA-1: 34d521f8f4d164441b9fbec748c36b4eb9ab53e4 SHA-256: 2aaa9d6cd74d2bd20fd8922ccffdf871522be0f7622c6c87f10ec6303b52e51e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9766

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://bundoreh.com/fckeditor/files/file/98543182757.pdf In PDF document text
    • http://thuduchouse.vn/pics/file/85414815882.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/32411662919.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/12112450322.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/80953097703.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/31492501642.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/zowetunapudipafimofudumo.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/11291633702.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qicrctcp5pjfln81v3ql5aolp9/5517453035.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/30f01ff722209952f856e548528e7124/80233170406.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607829cbaedc9---60048978987.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/bukotadekobi.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/l9hdcgdgoqt1a3hco1k2o9thsv/siwubopakubuduz.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/sipexidopenokutedu.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/92873212158.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/patamew.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/8j5vk81vc3060nu9b9m4v09nh0/dozeporibubebuxatagan.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacee8aa8f6---renuvusebifutir.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/jubekebogifokejisek.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/boxevezesenafosaxagi.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085c822e9738---ditamuzet.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/79245131563.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/5043915257.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/27320882552.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/gominudonowijib.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/4a15e0930955d2bb6255d883cab59691/zilotosudoja.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/64542393923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=practical+file+index+page+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52B 16016 bytes
SHA-256: 6c73bfaf07203ff631567400f5e600c77f8a3b9577b0ff044372013461c3f0c8
font_02_sfnt_off00010ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED1 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00012417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12417 10612 bytes
SHA-256: d6820bccf8aafbd7b9671c9a78cfcc824bee37a66085864f0c1f3baef1e564b6

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