Malicious PDF — malware analysis report

Static analysis result for SHA-256 1668f240dc417b2b…

MALICIOUS

PDF

94.7 KB Created: 2021-07-04 20:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2ac76e126db9c3f86a7c335fc25c2ef SHA-1: f74d196afbfef23079a08b5ce30f1c99302016f7 SHA-256: 1668f240dc417b2b852d7731e18db03d2f53008bcd51818fee66c13723f62fc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://omgmediatank.com/userfiles/files/zudulekozobisujekidawe.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b234da400c8---30097277617.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/75127a3d7fe6c3431348d80fe46cbed5/57861772942.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/840fe96704d6a8453ab7db821af07567/94030067489.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d39bd5eb5a---donekasivuzulusozigetines.pdf
    • http://kythuatviet.vn/uploads/userfiles/file/lopazivubediwo.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd626bd2a48---mukenoxesekux.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/13ab51ac57b280f2be207b6268dc78b2/widelisofimupitoxunidif.pdf
    • http://ankaser.com/userfiles/file/473014896.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/da1254a7ea45758f5bfdf4b35ba4ff1f/48884077508.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d392e99859---sozurawisebibotifelimadi.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5945cb21a---guselefagisezom.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/fixab.pdf
    • http://peusch.lu/userfiles/files/lidumutowuranukizamo.pdf
    • https://mfdesign.hu/files/file/fubetidimojamepafilarikez.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160ada912e09fb---31657677116.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609926d76e729---duvim.pdf
    • http://alimentosldm.com/userfiles/file/95430386325.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b00c8c5420b---67774566062.pdf
    • http://www.lugashotel.com/data/editorfile/31104494238.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/19fce73ed1ea69ad5d8748a527c6e695/23647742879.pdf
    • http://zulassung4you.de/bilder/file/89330729972.pdf
    • http://acpiindia.com/userfiles/file/jegepetigitada.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/402fd13318cc478ff192553526ad9fc8/35898673900.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+foxhole+court+ita
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111d8.bin
3ebd3ed20e70841ee5d0a2d0a08a37c9a15afdd0ac7e6cd9d857564c64bab463
pdf-font-stream PDF embedded font (sfnt) at offset 0x111D8 17936 bytes
font_01_sfnt_off00013f64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F64 16792 bytes
font_02_sfnt_off0001577b.bin
9260bf1939c21b331585cbcf839e316ea9ad901882929ffb7195396ab27d5721
pdf-font-stream PDF embedded font (sfnt) at offset 0x1577B 10324 bytes