Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a3636d72e27f08…

MALICIOUS

PDF

89.2 KB Created: 2021-07-03 08:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 927efe3363804061f37807a906473cfe SHA-1: b445574961b15ff05bee6c346cd332450ead04ac SHA-256: 39a3636d72e27f080c8805660edc3d436d8927a4fc960f3ce03b0f8c80629f2a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised CMS upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or engage in SEO manipulation. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/97e6919c13729787eefa22e95eabeb86/lajejilebivaku.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077c228b63aa---46898706211.pdf
    • https://guruamardaspublicschool.com/userfiles/files/10921114404.pdf
    • http://aire-limpio.com/img/editor/file/54931426422.pdf
    • http://nhactheducthammy.com/upload/files/49783679316.pdf
    • http://sillajen.com/fckeditor/_upload/file/jerez.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/91236497963.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0c3ebf092---poxemukudifinaduzupibumo.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8245420814---37729077942.pdf
    • https://sardavetri.it/userfiles/file/tezakut.pdf
    • http://eksan-ltd.com/userfiles/file/24022639047.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0dc2ee4a4---19592960456.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/osv275dd1l0ucaobklb2cg3l9m/20169807258.pdf
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/sumepili.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d42f28952---duxeratim.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098336f0ee9a---26434977099.pdf
    • https://bostoncake888.com/UserFiles/files/52659115805.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16090fb9ead78f---barivegilopatamebapobuv.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077596590839---terez.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090e1e843744---tugomamazotoxa.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a11cf37f611---nevuboze.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=codes+for+pet+ranch
    • 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_off0000f7a9.bin
d017bbde8630d1f854f5c691da4729148983ac7ac69607a593899d4ab3f60d59
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A9 10608 bytes
font_01_sfnt_off00010fd8.bin
80c62c54e020a9dbdeaf8e1c5a78b8df52dab4db6cc3d2a06bb3480392bdc7a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD8 18072 bytes
font_02_sfnt_off00013fc4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC4 16792 bytes