Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e61ad1acaa720c…

MALICIOUS

PDF

87.1 KB Created: 2021-09-14 05:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3af6d7c5e9bcc500736afb5880bb7b27 SHA-1: b5112103d1a27a5adf5b2c8d8e2a85b6cb85231a SHA-256: 95e61ad1acaa720cf9612d3159564e2a07f359ff726feb98e77834c3c91097bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF 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 compromised WordPress upload storage and other disposable hosting, suggesting it's used for phishing or SEO spam. The embedded URLs, while numerous, do not appear to directly execute code but rather redirect to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffaeed2cfe---83821923946.pdf In PDF document text
    • https://tennis94.fr/img/pics/files/rapopilevajadepapejote.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/85931802367.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/82653765125.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/95622201300.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc0ec5d0c0---22777262517.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4724182095.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb0d539149---60420170649.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/pepoj.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/93643041663.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/vovasunowadodipujananuw.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/27554827260.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/jusexom.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/dowokunanedebivofofidob.pdfIn PDF document text
    • http://szwygs.com/upload/vukon.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed6e78d3c0---60042458114.pdfIn PDF document text
    • http://darec.sk/files/files/rufuzabugafu.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9svqaqadr1qi6l98t1fdufr4dv/wopudifijefot.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/gunozamakilufox.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/jonamimenanidiwisexifu.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a816894d4---76837191829.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/tenozizilawetisawilovexak.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359c48a0437---dixidapedujujenaxur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=apple+contacts+to+android+phonePDF 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_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 10592 bytes
SHA-256: 7aa26fe90eebe521b1d0c61a31aff80f28622af1d0b5c4bea0a3752e08b4ce53
font_01_sfnt_off0001074f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F61 18352 bytes
SHA-256: 534e3d8b22b0a3f132aa3d4743dd1058a4c7c7aa30cf5506111874f6492a65a2

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