Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a957674aa5868b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 08:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 27d425a4ebc5dc69a966ec13b5692f13 SHA-1: 98fcdb1f24f33a62b87d949910e36e9ddeaa48a6 SHA-256: 93a957674aa5868b33b7d62b343c53e4c850d535478027aaef1e5e26cdc36104
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS upload directories. The presence of external URIs and the link farm structure suggest an attempt to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.sesc-am.com.br/Selecao/ckfinder/files/23376655157.pdf In PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086395b032ee---28094983839.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0885a64d6---kulenamadorumofabadit.pdfIn PDF document text
    • https://sambelteri.com/contents//files/mifivuxir.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/b05ecfbf33800f31ee1d4a742203aad7/42883426489.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/563082678b7d1436ef1ba71b1ff47ae8/84779826909.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607307cadb395---matagu.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/12898703464.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/k07hnauavk8j9qq9b227vjj2jn/7529308636.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123befc24ebd---jabixuposudipeboj.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160848d23a3416---zilosajivosuwa.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/vuzelapezowirefasipol.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7928c3c80---71324623612.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/99676811173.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/48972591559.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/j6jpnipltmp7bi7cn589ndh03l/juwukipa.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/febitiferadoxelifem.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c14550766---xesuzomaxosawe.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/10094939321.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/684ed404128fbf5b2b475bca1bf362c8/zamimibejobiduvexozisa.pdfIn PDF document text
    • https://signika.pl/Upload/file/mivuzubosapazovebepajaza.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/35924106241.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/13380704750.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/solikinoloziviximat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=giardia+effects+on+humansPDF 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_off0000ddcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCF 10832 bytes
SHA-256: e4ff0ef06ccc1806d19fe4cfc43b31cd3c96ba33f503897e607656838f462b58
font_01_sfnt_off0000f6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB5 16676 bytes
SHA-256: 0a76fa25388cb13ead3546c59020293489a26e22be343cef45de3e42c8bc067b

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