Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4b509563036d42…

MALICIOUS

PDF

88.1 KB Created: 2021-08-16 06:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 3aaab33eff17ad88ef3b15dfd34ddf35 SHA-1: 8f1b3cc68db17e6c39003b38003328b6042af347 SHA-256: 9b4b509563036d42c8dd89e8afef10ed9559c1db3772d1378e0d9a44f2ed1c57
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The heuristic firings related to link farms and compromised CMS uploads further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://catamma.ru/uplcv?utm_term=que+es+un+gur%C3%BA+informatico PDF link annotation
    • https://stvorki.ru/files/file/wutoza.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/13505308522.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609741b24d038---dobiritizidaganiripenikim.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/xawumolebikisokeja.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cea77c45ae---96221069701.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/wanegasizujigixika.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/toganebimavewi.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d48bf1806---wifoxadifuloso.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/bf20f5a3b936ccfb43d5d0e38735c8d2/41907081537.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/ketozofe.pdfIn PDF document text
    • http://dongxuyen.org/upload/files/21071212259.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1322a4255---poverew.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/99041829766.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/1c978d02ed525e782c39031616f50a5e/25481664994.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/f7d5476016841df121aa6a85e9ae30b2/36714081478.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/50480884526.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/8eekj0m8kn7spam5c7gpph1shf/47023287653.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607b995d62620---lixizudiwigasimakazo.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5adafdfb---53145866529.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/464b97a6a081b835ab8134a11d13f07d/42108261082.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/210550306179.pdfIn PDF document text
    • 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_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10694 10908 bytes
SHA-256: 2d05a410c09482173a7af1c6d15f5e79dbc6a3562c035367b6966623162281df
font_02_sfnt_off00011fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC3 19332 bytes
SHA-256: 77f39888d113e33dfcecf8f59cbfc940db03b33761b087fe1629911c50407a9c

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