Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4647f97a6de8b0…

MALICIOUS

PDF

92.0 KB Created: 2021-07-03 19:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 43ca728a4107a28eaac3555c3e63bee1 SHA-1: 3bc6014395d30193bd9f0bb57d11baa2ff773b6f SHA-256: ca4647f97a6de8b02e6ca2c0e19f5dfe3169651504eb061213b761a8d81d5396
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple compromised CMS upload locations, suggesting it's used for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are strong indicators of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160db27691d098---65495246269.pdf In PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/gipeg.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/pikedafip.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tl2npa5cgr33uvqnslrmt89p6p/92930902086.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/wadiguzeve.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/pagidifuribuzigajibonumir.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/tobos.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/f3d62c48b227130099f935021cc92514/8324967832.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c5f75698b---12982307981.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/fobalegupotizewamoxa.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/wakabumovolanafawexogixuw.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a490c02acb9fc103f9d01bfda4997940/vewezakotebuwewipuwoduj.pdfIn PDF document text
    • https://aedwea.com/upload/foto/88102508195.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6db2acad1e---43940445561.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16089cfb360358---57199580.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b86c1f3826a---49855333234.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/suluxo.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/024bee8803d987ba8b97b124e486278f/86267357139.pdfIn PDF document text
    • https://mfdesign.hu/files/file/likogope.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/libizuwosuxosefavape.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/d4c1nf2q1hu2rqeiunuceggr15/nonusojupupusoxekuten.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b70e601bb---4808840008.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/29807037106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=neil+gaiman+the+sleeper+and+the+spindle+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE9 19780 bytes
SHA-256: 1f33da665120efea64a0f2418e12606d2421f52fbc830b0212e2545fc06f5c88
font_01_sfnt_off00013069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13069 10800 bytes
SHA-256: 5b8846f8d7fb137d461c1688ce6ab484821579dc6e9de7d503477af16e8c8bfc
font_02_sfnt_off000148d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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