Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e7a3791865c18bf…

MALICIOUS

PDF

84.7 KB Created: 2021-09-13 08:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ceccca019fae895a8c712177db3c054a SHA-1: 200cf5c08ccb8025cfb8535bfb587bef96cbc0fc SHA-256: 6e7a3791865c18bf971fb5727baab82920f9fbb35267b82eec3f99e047f12f19
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDF files hosted on various domains, many of which are identified as link farms on disposable hosting. The presence of a 'download button' lure further supports a phishing or social engineering attack. The primary goal appears to be directing users to download malicious content disguised as legitimate software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://rewaqousha.net/userfiles/files/587858556.pdf In PDF document text
    • https://shibbirs.com/media/files/58778400989.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/13860328270.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/25037817840.pdfIn PDF document text
    • http://vhshf.de/File/58573236597.pdfIn PDF document text
    • http://bdnchem.com/upload/files/dodorasasekejosotat.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/23535804407.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/32689656048.pdfIn PDF document text
    • https://33mobility.net/uploads/files/nunanekode.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/88978752443.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/62099440645.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/rivapipobijevilin.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/55832747305.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9938b0c5e---27070145293.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/flhk9tu2cpbvietfufsnh7cvi2/36967478750.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/kuvuduxetereb.pdfIn PDF document text
    • https://porfic.com/fotos/file/9373222761.pdfIn PDF document text
    • http://standdominica.org/files/files/tesofobize.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae8a4dfce0---sujurugugefuf.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/50230601809.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/97553076321.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/62428859024.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/pewetutexikenebuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=trusted+apk+download+sitesPDF 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_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 10624 bytes
SHA-256: d9ab4cce6b7d7e64833cc9ded9509c8ebe12dba7f8d344af0e1cb8567be09bea
font_01_sfnt_off0000fba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B9 19216 bytes
SHA-256: bb7fdf94489fce75297a25dbc3f4c5dcd17e6c04581e40bb6fbc0415c1831063

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