Malicious PDF — malware analysis report

Static analysis result for SHA-256 21845bc7e8a1d282…

MALICIOUS

PDF

84.8 KB Created: 2021-07-20 00:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 554079ae3eb7f6f5dd9678516202a428 SHA-1: f9121841912965228fd1598887600e7d2f53096b SHA-256: 21845bc7e8a1d282681c98ad556a4157d70e23bc0ad49a527e2e80fc08991257
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm or SEO spamming operation. ClamAV and the ML classifier also flagged this PDF as malicious, suggesting it may exploit PDF vulnerabilities or serve as a lure for phishing. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://pizzeria-millemiglia.de/app/webroot/img/editor/file/weriwivemubi.pdf In PDF document text
    • https://geneticapanama.com/userfiles/file/97755523651.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84bec9b79b---binagof.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/4c9a2ed2510478f7b79533829320c078/furusukotaladakitovuz.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/90889879306.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/24899875596.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/957e943bb969c0895d1a12e167404f01/99280940451.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4193fe86897304c2384f963cb6f1e551/badipukekubipirinenugax.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2078de8f1---77219587150.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa1db06353---nekedugulugumigefameku.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c98b6dea7d---93004450096.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/96637170735.pdfIn PDF document text
    • http://tianfonmm.com/d/files/49230975218.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/5457076827.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee7cfc6dcc---83759559523.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948f56dd4a1---46363889031.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077f5840d1f9---zovutuwojili.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/ed193b82d35ce8a57676193482c4f908/netekisinezuxejugibilix.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/worum.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/608034d57bc31060be1961eccd036eb0/16112107924.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/rafopotadigenerilefa.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/64370911963.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/74r9v7upc2879dg4la1rub1ca1/2454882186.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609289e3be66b---75169087937.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/60718551428.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/69447974472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=easy+steps+to+learn+spoken+english+pdfPDF 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_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 16500 bytes
SHA-256: 0b5d9d4048501b11737ef0eb8f2ddad86aaa1730dff6ba79ba0886fa4b727f8b
font_01_sfnt_off00011460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11460 10964 bytes
SHA-256: 6c642eede6dae981c3a805a06c330886406042416c281a6bab2c0e6904db1798
font_02_sfnt_off00012d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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