Malicious PDF — malware analysis report

Static analysis result for SHA-256 23406dd367852a76…

MALICIOUS

PDF

87.0 KB Created: 2021-06-30 17:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 341ad878b25e42b0a4dfdcad05f6fa34 SHA-1: 9ae228e2a61db388a9ac013d83fb98d97e986a00 SHA-256: 23406dd367852a76bca424016e8eeb9f67ed2679772ecfcbfae327613f455dcb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised websites, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure itself are indicative of exploitation techniques, likely to redirect the user to a malicious site for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://formel1vermietung.de/userfiles/file/69566316702.pdf In PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/aa6b8cca0caea335a3c5a27dbd165a5d/61194946800.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/33341122495.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a25978e2b---mekagasa.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/lonuzi.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/99813352904.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c3d00a426---wedipa.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9657b4cc93---61693769863.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/b95bfed5c6a717658f7785d9e63180a1/bipepekiki.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072669fc8be1---lerofolowobavafi.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/kihi2jnplpjhtr10jgu5sq7gi3/71846505073.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/f40e86a615f69346c9a7e85ce36421d4/5778657136.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/bexinitep.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160775db35da32---80231719759.pdfIn PDF document text
    • http://allycatering.com/userfiles/mugadul.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/gutoto.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/23288836125.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/juwozixegosigukabezota.pdfIn PDF document text
    • https://ka-base.no/images_content/file/64495387434.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/fidaxevawakufusaz.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb43d91825---25326611342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=signs+of+a+heartache+in+a+manPDF 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_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 16768 bytes
SHA-256: 4142997e1a93859fb34b6c50fc0159fa225dcb46d8f5e19c972fe2bab378ddef
font_01_sfnt_off00011e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13641 10812 bytes
SHA-256: 164c77df9cd4658bdd5b17ab5ccaf760b734914870d72ac7b12258f79335e8d7

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