Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d10bdbc9cff9fd…

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 18:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9c1d6c666a4df1e321f639c06ab72fe0 SHA-1: 5e32fd9f6ad99d70313d8dbf2966d5f12a613fa4 SHA-256: a8d10bdbc9cff9fd59ed840c8d802c17421ca3f2a9da04d070ed9f4245d46ca8
172 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and multiple links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to host and distribute malicious files. The presence of a download button lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tidymoney.com/ckfinder/userfiles/files/fotixajowirepuboduxiwudow.pdf In PDF document text
    • http://pc75.net/upfiles/file/1630722156.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/586a4bf8ce74e58c09c2aef5613c31c2/50147775058.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/32869847313.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/36875065309.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/nakomigajif.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/89a336fc0e51c8da21440e8368916cff/gelenigurefunevusipin.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/boredovijati.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/ruxotuv.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/7097445569.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/razaz.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/tejiwesur.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210906_A65B9CD28CBB8944.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/e120bbab51e1835b9abe0630fe5772cf/69060764740.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/7729602081.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed4a516980---sinuzelur.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/26843003079.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/bunel.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/pewegoruzedekawo.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/22220874109.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/11072201101.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/19930347676.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/vafixivulatexowogeleb.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/28152724625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=carx+drift+racing+2+mod+apk+latest+versionPDF 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_off0000d48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 17180 bytes
SHA-256: a0450c3f13d773aa61ca5cb0682b0c89296c4839b4c6f652b61457906184056c
font_02_sfnt_off00011923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11923 11376 bytes
SHA-256: 8c39b59d0fff453b7a4539b9654df7ebc992af94912eeaab46bfedfc43d686f0

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