Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a144f99ec2c993e…

MALICIOUS

PDF

97.6 KB Created: 2021-08-25 21:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: ccd483cf52128de65dda70fd5ec9f1dd SHA-1: 854d81f52162a8f93763f653d8b1c6ca8deba9c9 SHA-256: 4a144f99ec2c993e04df8516ce90f9a660d8fd628e223877ef09a113a3f308a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • 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.
  • 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://nature-revive.org/files/file/wetarasiki.pdf In PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/zaregojekowexakipujekab.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ej0uraiokjfjdhie0rsh7iruhs/74731518903.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dbd408784.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e7cb134db---lunozidavudekopu.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/d9c6e2971426cf2e59a0374734a11d26/xenaziwenotejamukekip.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/20578445611.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/goxis.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/moxigixikatigamizana.pdfIn PDF document text
    • https://85097781.com/upload/files/83176751595.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607488fe38cff---donaderexuzigebupiterojej.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/odd8rmiu70m0bb6ku143f5rmh8/47276023954.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/sbtjguti141opg6ofbnj2it471/72480580759.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/magexapodigotev.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/lukatoli.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/21531689105.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/31173274261.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6ceb6f5f6---64652007886.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/zubokozisoxinubok.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/58668512780.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083476c0ddbc---66856021702.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/82989804256.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a493413deb8---wugofidawafosep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+does+a+stand+for+in+medical+termsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011504.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11504 18776 bytes
SHA-256: 3c6e52d3a46858835dfe6ae1d84f1dc902e9b06ce804d8ffc507925e9e0c12db
font_00_sfnt_off0000fcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13325 17096 bytes
SHA-256: 234b3164023eaf1fb38d9ec2203ed44da092ace7d273faa2c55bc6af2285c934
font_03_sfnt_off00015fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FBA 10732 bytes
SHA-256: 039e429387d7aa23342e1c9a856c29f6a4276be3e0746dacfa3969cef0c71739

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