Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7d20724a0a24f9…

MALICIOUS

PDF

89.2 KB Created: 2021-06-27 18:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d61d1b831ab1d1319eeeecba0a5a42b2 SHA-1: 220af24c54939c3d60eac9f8ad0b9bb47db71246 SHA-256: aa7d20724a0a24f9e057da338b8a255ac5fa032c892b86e8461c53733a33e1b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and disposable hosting patterns further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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 http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160ac17c5b1591---vofuzapif.pdf
    • https://kltccompany.com/ckfinder/userfiles/files/82010204556.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/252c509d5e5e638ac65511ccf73b77e3/99419549105.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/7cd4b4e4fbd828efdb29284554b04bd8/musefosos.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/7cdb7d9ce6af979d23d82532c1628d7d/kalotanuzenosexavi.pdf
    • https://benqmusicworkshop.com/fupload/file/ditevaxezovoxikub.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6aed8e672---46224435595.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46294b6b5c---71421921370.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/p9m2nv891qe119mm4196jq5o55/rasigemonimike.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba88d96b0f3---lilexot.pdf
    • http://meteosputnik.ru/userfiles/file/doxofixunubovekarimewimur.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1bbb3d971ab51fa65a6be5b02a3953b3/67463418358.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/d37v3cnh4db6u3ucgs1d3l1j2e/42639998392.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb7fd830ec---tevod.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f9e41746e---83366787969.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/efdf00914c1235a73808ae970802892d/83733285442.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/vt271jouq4fdvqh6bgcj4t4nlt/xipowibiluzifonaxev.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/gaxivolez.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fcf16f9bb---83917817779.pdf
    • https://prosaison.fr/userfiles/files/zaropufip.pdf
    • http://9meclinic.com/ckfinder/userfiles/files/tesagugukanasifu.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/d046dan6cecmf3podl1rav40ld/40982286105.pdf
    • http://asianmosaicnyc.com/userfiles/file/53791738589.pdf
    • http://markone-tools.com/upload/files/11162017316.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ab937a2c42a---21804971034.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=animal+jeopardy+questions+and+answers
    • 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_off0000f6b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 16792 bytes
font_01_sfnt_off00010ec7.bin
3a658b644c9a69e2c45f2c367056eb8261ea193552fbfcfe7352675129b7caa5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC7 11112 bytes
font_02_sfnt_off00012876.bin
8d98c96f4cef9c47cafd7f62be054e49cad5be25a78bdddca70b6be4feba407c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12876 17804 bytes