Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6cf97d779d5d0f0…

MALICIOUS

PDF

68.2 KB Created: 2021-09-27 16:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d8ef866287e04edba15bb75f0f86d40 SHA-1: 39a48f465e4a878c16e530d8cfe39ab539ab2005 SHA-256: f6cf97d779d5d0f0ba9b33c5a474b1b570e6b83bbbd390c28a750b2dc47c9970
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristic 'PDF_IMAGE_LURE' indicates it's an image-only document designed to trick users into clicking a link. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest an attempt to redirect users to malicious sites. No scripts were extracted from this sample, but the overall structure and URL patterns are consistent with a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://fuerst-architects.com/uploads/file/51235063472.pdf In PDF document text
    • http://vyveva.eu/UserFiles/File/jiduxujinapapi.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131624f10542---66346239107.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/sijusedikisop.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/dimudatutadijeso.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/85762466495.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1614122626b930---82999198357.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161313bfb49fc5---lotebugibekukozirexedij.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/vogerukedugosi.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/rukoz.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/63818845523.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/rigurasedenatijaradunowu.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/87437421281.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/mso8ajd8ai3qmmev23j11o94cl/vejebajuwuwijanovodi.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/wepanakuniriruvizajodaw.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e007062b62---zavutuzaresux.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/42441657554.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/91761166141.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/4417029841.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/56673433467.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/rowuw.pdfIn PDF document text
    • http://bndweb.nl/upload/files/wenumutadobad.pdfIn PDF document text
    • http://imi.vc/upload/files/zepap.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/97868888287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+free+football+streaming+sites+no+sign+upPDF 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_off0000aeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEE 13900 bytes
SHA-256: 77eb898d1e3fb5b59fbf1397fcbd00038042669a720beb664645b3457ec427eb
font_01_sfnt_off0000d194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 10996 bytes
SHA-256: e685ce6fac3e275995f808586a98ccd19a0a7fb2b0cf1bde879a2630dda7251f

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