Malicious PDF — malware analysis report

Static analysis result for SHA-256 baec857dc9c5e6c0…

MALICIOUS

PDF

71.8 KB Created: 2021-09-03 07:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 23ebb9a5009543e8ac9423a1ce6d72ad SHA-1: a34cfb336e0efb5d3df2bc82e2af317508780069 SHA-256: baec857dc9c5e6c08d0fd3d4c65f18675ef3039f3c96d83d2ea371d1e4e9310b
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites, likely to distribute further payloads or conduct phishing. The embedded URLs suggest a tactic of disguising malicious links within seemingly legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d3m2tes299d74a7a7pvs8otpq6/26819063410.pdf In PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0e9693918a9ad9cb521885cb28ba94c5/madidunak.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/fce75a76915af890756a74676d82f85f/nomevuwigogiwoni.pdfIn PDF document text
    • https://equinox-e.com/upload/files/56254402676.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202108191851098886.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787816e4e5a---lusexexa.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160924e2e995f4---wogawulikoxumaz.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/55798185922.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/5gngqnh0um0piar6kdatpr1gv0/mesijokozisibimufo.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/39845067415.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/98441994723.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/56978550764.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3fe3924dad0731cb1f3cfa936e67f6ed/bigivavokiretabafed.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/97726366665.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/1a82d01ae208afb0cc3a0245802b87e9/77103094727.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc8d6f12df---zigefevevexadininexuximuz.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/unpc8oa7nthprh3g0jgts4q7p2/72436572178.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c1afd0c4487dcfb48ea0a89f4b9e553c/25418580515.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/218378338.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/31090876970.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/reban.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ready+set+grow+book+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_off0000b8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CC 15824 bytes
SHA-256: da312cda6c5e67004cacc9006cbe45fc266ac42d9b56c4c40d2e158d23bd32a6
font_01_sfnt_off0000e0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 10908 bytes
SHA-256: bb1f79762fa5aa42a5af8375f920dce71ba9776a80ebf17712d59752fdddf183

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