Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a4564ed64a9cf9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 13:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fee251b700a5a0ec2770b7fb39c7e7e3 SHA-1: c1b2cff7fc16262780f24e87f33426784d9eaf05 SHA-256: b0a4564ed64a9cf9a1203d1d4bdb11ab7a7db994cd973275058f182dbd856b00
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://eau-msu.ru/ckfinder/userfiles/files/40057345464.pdf In PDF document text
    • http://bronia.org/userfiles/file/20734389153.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/livateritijobamedava.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161359f00ceb6c---46074233371.pdfIn PDF document text
    • https://znalac.com/userfiles/file/41114662904.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/lanapunuj.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/82329934162.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/dujemisubalomit.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/18306102283.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210912/files/20210912181228.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/51995414158.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/98005684485.pdfIn PDF document text
    • http://nature-revive.org/files/file/12443459448.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/5293318245.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/238754638613223e475af9.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310b96c270f---mudaxorebenotiro.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec9d274a97---42514471660.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/sepatasiv.pdfIn PDF document text
    • https://dhesient.com/media/gixorogi.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/zixoxokixepubej.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/mazigajipizifigapuwuso.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/noxes.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50994426476.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/56731436646.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/debidiwepodovibera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=flash+apk+no+rootPDF 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_off0000dd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD22 10192 bytes
SHA-256: 91963bf219179aeadab6e45d96ba843b12fa8d35f50e85b65dc55a836583f137
font_01_sfnt_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 17724 bytes
SHA-256: 64d729b86a41d2e5ffca66d7f7abd2d93eb28a6b4f110847483c52c0e4254111
font_02_sfnt_off00012228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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