Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3b4dff409d9f9d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 12:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb89e02216ad79519f0e57d429bb65d2 SHA-1: 095856bc92903444d49db036cb1257e16f612f17 SHA-256: af3b4dff409d9f9d41d9a40179e49ebe510245bc45113e04175d41e0f5bd0d3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://web5gstore.com/Files/files/miverutewijamikojezase.pdf In PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/98789157608.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/pometuraraxew.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f4e592e893dbfb88efe6e507dde46294/jopuj.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/95846079610.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/subawifunewivipenuvub.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/2826307397.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/8097716800.pdfIn PDF document text
    • http://goldia.cz/data/file/vogaxusasusakerir.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/pitaronafewaruta.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4cc9a4e24---vitita.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/sujuzopotigu.pdfIn PDF document text
    • http://intersonik.eu/upload/files/xaguwe.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210914_140443.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/19745371200.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/66225484154.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/40420716672.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/buxovolus.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/9528111461.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb7aa19563---pidenerowinipapexikubetow.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/15426516053.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423eb9106a6---tazozilurufup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+music+ringtone+downloadPDF 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_off0000e15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 10880 bytes
SHA-256: be607bc5f9c740aa961601d7694fcb1c715e7a29fc79efbd8542003be88b2dde
font_02_sfnt_off0001127c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127C 18728 bytes
SHA-256: 04ebbce3152d32e058a835863054356a108bcf7d638459ef2341aae338efe136

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