Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2ffdcadbd31057…

MALICIOUS

PDF

77.5 KB Created: 2021-06-29 01:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fdb8a2f7387007201092e2ea55b66c8 SHA-1: 2b04bd6c58c6888459beeffc145950ad1651977c SHA-256: ac2ffdcadbd31057e2993a25a68b639e44dd0fa19c8018d38ca2cf11c9d2141c
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The presence of these links and the overall detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084474b186cf---bazavelarofarozujojadi.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160d92e4189e24---57982081006.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/gefh2n9j641dh29170eouifr13/fofubavetodutepatus.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9087a493---xogekisojunepi.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4uk713lcs5sjs07d51c01gqnch/74539818409.pdf
    • https://xanbiente.de/userfiles/file/resilova.pdf
    • http://effektfilm.de/files/file/baxomatuwe.pdf
    • http://dolphinegypt.net/userfiles/file/9878769323.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ce7a3fa65---94957388620.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/80704675335.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16073d0cc2492f---ralutosotodejaf.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090eedd2b6ca---70747042255.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/0o7v8guse3rljfni148j706sg2/korit.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f35920a3f---17484525372.pdf
    • https://hse.tw/upload/file/fuwon.pdf
    • http://fine-cottage.ru/userfiles/file/fumibig.pdf
    • http://cycling-software.com/files/file/nimonijumukurudi.pdf
    • http://pk.mo/userfiles/file/viwasapifuxagusu.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd2a98e07d---jusigi.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea8190045---sejomota.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=driver%27s+license+study+guide
    • 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_off0000cf55.bin
0f93864631a3a29edff267e0d40fbd8863cd83ab340ae245ef78b6b40125d003
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF55 16132 bytes
font_01_sfnt_off0000f8ee.bin
32f577ccd3650065f87248e58672e5384c6e2c0140cf9ee3427dccb8c8e3ed5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EE 10576 bytes
font_02_sfnt_off00011117.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11117 16792 bytes