Malicious PDF — malware analysis report

Static analysis result for SHA-256 238bfcadca340041…

MALICIOUS

PDF

69.3 KB Created: 2021-04-30 02:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e1236e7c9013505da463a4b07f31bb2 SHA-1: bc8cf7190cf6a0a6bf8b013e5ab424f5fd314456 SHA-256: 238bfcadca34004123e6f3b20aabc47dc97c679cf53f2e5fe4df84d7e092657c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links to compromised WordPress upload storage, suggesting it is used to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to trick users into downloading a payload from one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844cf7e71f2---50030365495.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/u8dbbnile6b7gu2t0q2sqd9qij/45385503117.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/8b40531ef9124741755f15b5b57539bd/tedig.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b589a67a25---waberokakekozit.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b975f95f1f---jamaxetagopeginuguxobuba.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d554d3a610---fusibotebubetusiju.pdf
    • https://amrapalispot.com/userfiles/file/wovepi.pdf
    • https://alice-immo.com/userfiles/file/tafapo.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/b15458a7375cd1275e8883b6a5a67909/38902408315.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/b53f4731fe857dbda687b77443e8e5e4/72280142019.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/df3a24feccb59b189df5bdc7f43000ba/75457393720.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/fa17c6d31471569259cf17e081fe2d04/gikekijilevajepikefunu.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834f4cd265a---zudulobax.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0fc3bf150ac4ca59d7bb357670d56ee6/29215475779.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160770268335ee---wutudakevapalomatozum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=alphabet+activities+for+preschoolers+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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d13f.bin
3f77b09fa988f95a2dcb26d26f57fe31aff3470538beccd5dafb8f61ee39b21b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD13F 5432 bytes
font_01_sfnt_off0000e3b3.bin
3c7c5940837c427c4f25968aadbafefb7f0e200aa876a5d85c769a65d7a9616a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 10692 bytes

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