Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0301b3baf04128f…

MALICIOUS

PDF

77.5 KB Created: 2021-09-18 20:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6fd03e87e6b845eef7a066138e5c9ebf SHA-1: d8665f042c2159b21ab6023297975d94250f7526 SHA-256: a0301b3baf04128f79a2148923a315900e3fee10de95c70f95a8bd3079655c6a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of a download button lure further supports this, suggesting the document's purpose is to trick users into clicking a link to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • 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 http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/0d57b7dcfa383abfa5b43007971ffc5a/7731532509.pdf In PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/61879464016.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/68260565777.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/jizijojumofogixa.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/xotukajowomovuli.pdfIn PDF document text
    • https://nakshistudio.com/ckfinder/userfiles/files/31923861334.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/ruxiwawosu.pdfIn PDF document text
    • https://luminex.pl/upload/file/22635685559.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/pidipijoxo.pdfIn PDF document text
    • https://alkoplast.rs/files/31112337572.pdfIn PDF document text
    • http://dasbluemchen.com/13819468385.pdfIn PDF document text
    • http://standdominica.org/files/files/lazafakagoru.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/38578897106.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/nutoteronejemukomosafevi.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161349d1bd79f7---7868338857.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/55217008402.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/17502477593.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/robiziwigilapegufo.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/sojufibakulefopi.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/kobitudosam.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/tejewiwogulazavix.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/82489338232.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16136103ec1eed---pakugebagigimon.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/domeboverididuvijoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=gta+v+sa+modPDF 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_off0000cbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE0 17864 bytes
SHA-256: 508b3e50ed946259269562806b37ac14cb627e328c3780953711e27275df1ad1
font_01_sfnt_off0000fa9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B3 10040 bytes
SHA-256: 50c1e222575eddb9ebb63562bc36b0b9121568442c229664e66a98cc41e558ca

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