Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e685ae9512a3ba6…

MALICIOUS

PDF

92.8 KB Created: 2021-06-26 18:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46757cb50c766190e9ac4a70a7b7f557 SHA-1: f68d756c04fb87ce2a4a5e02bd09f27636c563ed SHA-256: 8e685ae9512a3ba6a8511bdf0a3204e68e21ed9d4773f0216123aa506100248f
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 WordPress sites, suggesting a link farm designed to lure users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to manipulate search engine results or track clicks, further supporting a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c327ea98ab3---42633184491.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/b595128a376d40f50f60d2db83f47cf9/sovajedofodiko.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/j4vc425oi1o24oqg75g0qn3dnt/43259912799.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5c02c2c5b3bdd2e3195216b026ec147e/wabavanufunaginuzeda.pdf
    • http://sevinctekstil.com/resimler/files/34399215605.pdf
    • https://artbynela.com/uploads/file/kixilowefavatijovaguwawup.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/50khpqfchdpt880vr8kl1heqe7/54332948589.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99ca1300fa---11105606002.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d75b734a---sesatafogak.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad1a7d7a44---553753118.pdf
    • http://fredericjean.net/oplusco/file/69894424257.pdf
    • http://beijingxinzhi.com/userfiles/file/20210603041023_659189068.pdf
    • https://orrizon.ru/images/file/zopaxuguvitogudopulo.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/oema3dkopfrjrofvu1af4jplu9/38529777561.pdf
    • http://animalscipublisher.com/files/upfiles/file/jidoripovipozog.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/jotedijunanofakuna.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/kv05c6i1uc4rtfjfao825nl1va/67440306766.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05161a9584---19213501807.pdf
    • http://seventyfirstclassof69.com/clients/60772/File/80154033580.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071922030780---41891298194.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608675cb31ae5---xafefug.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086efa1a7b92---voxovaxunovelalojaxasav.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=maine+coon+cost+usa
    • 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_off000107c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C5 16792 bytes
font_01_sfnt_off00011fdc.bin
13114851db52ebba06da8fea54e64b4b4ad1f53b192868c58b22b44f37e2c293
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 10172 bytes
font_02_sfnt_off000136c9.bin
b521beb252706dda1c6af3eca9d92ce0ed67f49b11e739cd3f4f242f0845e4e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x136C9 18256 bytes