Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7a5253a302634d…

MALICIOUS

PDF

91.9 KB Created: 2021-08-21 22:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a27fb7693af6847c6f01cac21cc2eb55 SHA-1: 7c5921408b8a5a0ed5ecc48a63a820ccc1caa6c8 SHA-256: 0c7a5253a302634d2ae9e041b6a3355f12418264be7a166f3b92913e7a961e0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload storage and other disposable hosting, suggesting it functions as a link farm to redirect users to potentially malicious sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e484d8ab7a7b1233852a8ddc8070746/gobagiva.pdf In PDF document text
    • http://sparkpro.lv/content/file/dajomupifemol.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/fagejomekemivenuketino.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/sifoxizusozonu.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/31266966132.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/69288172270.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/10580124297.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/708e6fd281ff1af9b89e9cbd205c9014/43164705670.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ac14dd1d7---96541167492.pdfIn PDF document text
    • https://baptistfriends.org/media/14436645644.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/polanamegumazowunoseb.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/1n45s4p157enquc17qj42nkht1/zevijemi.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/90879187943.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/dejurutunigo.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/33039393572.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210611_F3B207504E3C3035.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/92970859431.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/remavaxudaw.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee8710f7f9---lafodikodeteguzol.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/45024500872.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/vimilarujumamejadoweku.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/1dec57106acb9f8d8c398ef14d6cbfe8/kaxiso.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/rumudelabokijavomuvimugaj.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1c14b8b9f---tezuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=a+partir+de+cuando+se+sienten+los+primeros+sintomas+de+embarazoPDF 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_off0000fea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA2 10956 bytes
SHA-256: f1b994f0a2af4500842110ace421b7357da28b5cd91c460a28df4d515bb8164e
font_01_sfnt_off000117da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEC 18020 bytes
SHA-256: cb4d5b735105b76c666cb247f627c8417151ce307759e622639e6b2d556c0351