Malicious PDF — malware analysis report

Static analysis result for SHA-256 752ea478f90fc03e…

MALICIOUS

PDF

88.0 KB Created: 2021-07-16 18:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e5f065bca1aff7244be79a065d71e16 SHA-1: 896a491ade1eb50eae3f028cb6f97601e5eb77ac SHA-256: 752ea478f90fc03e204aa9ec69754a7ef806dcf98606bdd8ff16951bda512ffd
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ongnuocdenhat.com/upload/files/53074308662.pdf
    • http://agendatourvietnam.com/hinhanh/file/difavisaminuvowoporeguzi.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/10579b01bc9c994e5a01eccd2832dc98/7675045483.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a022c7448f---22591511420.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6a756dbfa2385fcf24ed0895e84c7314/tibejebaxupamukef.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/58873864286.pdf
    • http://tfh-filter.hu/_user/file/73233575580.pdf
    • http://euro520.net/userfiles/file/16213383591417397901.pdf
    • http://curry-box-deluxe.de/userfiles/file/16914007466.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cq5pv1i22fj1v2hj3ft2ugtsk4/ketejadalexokiwurax.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160803161b24ed---nasofe.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/n6q8g1fil01dp84aucnl4v20e6/16138425348.pdf
    • https://appfacile.it/file/bafitavolenixefegaseri.pdf
    • https://stratasphere.online/userfiles/file/58774592376.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadc12c82e---xopifevujefiziga.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa6e543de9b---woxuba.pdf
    • http://2ds-creations.fr/userfiles/file/42722155277.pdf
    • http://younewstoday.com/task/userimages/file/95875695576.pdf
    • http://prttour.ca/FileData/ckfinder/files/20210627_FDF4E78006028FDA.pdf
    • http://tonystelly.com/clients/873487/File/balelobinarin.pdf
    • https://mrdak.cc/uploadfile/files/xadulagebawabarawuvaji.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/9f60e60aced00a1d14adf08754f02b91/15471097460.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160765b22e39df---fudefejuleluzer.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=nicholas+sparks+books+by+release+date
    • 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_off0000f3d3.bin
30fc0f61bd2f797832f2506f1390b5a7aeac5e715dd9049ad937d3bbfaa341b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 18172 bytes
font_01_sfnt_off00012318.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12318 16792 bytes
font_02_sfnt_off00013b2f.bin
be43e511b41716c43008aff1e8d50426af8979ee2f3146cd7b695b86d1fc4e9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2F 10832 bytes