Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3056677d9e37622…

MALICIOUS

PDF

72.2 KB Created: 2021-09-21 10:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d6e0e0159e23f6e8a5693c7e88225526 SHA-1: 021aa6c86a560b917cc6d8070617ab5f0da9c07d SHA-256: d3056677d9e37622b1ff6de4f6d3fa263599586cc9f9bf98cbd6fb0617a0eaf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to direct users to external, potentially malicious, content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://studiogaleazzo.eu/userfiles/files/jekulutiro.pdf In PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/dapomiwabisowadiled.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/xuxibamovebura.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/soferizixukefi.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/9865004161.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/paberabositoxunawif.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/1essho2dnqoi3j5oaqi7jscdmb/29236770698.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139233171ae5---25434745274.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///xonazilafenibab.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tofukeveropuzenikewelesa.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210916_6E91A9BC381A415E.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ad8e08376---78342461970.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/9580915063.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/14371561728.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/55221036790.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4ba93f3fe---sipoxaledoxirufu.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/41028091003.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/64804388879.pdfIn PDF document text
    • http://cnispgroup.com/filespath/files/20210921092904.pdfIn PDF document text
    • http://furniture83.com/upload/files/tazodekiviw.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/32448683303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=text+me+up+premium+apkPDF 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_off0000ba28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23F 10232 bytes
SHA-256: 3459e7236a85e4d8a1eeac6a907a747b24af4c84b73d5653c67681aa843d98c4
font_02_sfnt_off0000e937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE937 16316 bytes
SHA-256: 662e169ea53e9afe7233c0e9575cc894318ec3c19fefe1b09d0920c36e14b583