Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57cfa7fe38c67da…

MALICIOUS

PDF

83.9 KB Created: 2021-07-22 00:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6eb3658a63550bf98217c234050ef73d SHA-1: cc1b5ab22f616764c0ad05f42003bb33df8369f9 SHA-256: f57cfa7fe38c67da2dccb1e2db7c849b398fd052d426ee41ad7b978b002a916d
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, are primarily used to redirect to these compromised sites, likely serving as a lure for users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/4079f8ed6823af08dbfc284a529e647a/62590349863.pdf In PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/fc1tn2ehlqh8j0qbuf8tdlvuen/28939016534.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/18159555547.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/pixuwewozugutivodofan.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/08a88e21fb457b5e9e126da6e2187129/15037109059.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf425a8a8f---92466996081.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f47deda93a---88618450456.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/mafevamulavi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kdupmfrpsmrtpv8a324kkktege/ripulolubo.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/0e6100d2a099a84a60d1199051565bac/pogetos.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/kejaviwepod.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccf7de4facbf9ee6b5f64b6dc00119aa/liratemelusoje.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/2d4bc79c2f20d00c88da89cf2488d5c3/43076719817.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/zimuvagirepumis.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dd99174e7de---38485266806.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3d571f7d1---kiwevesedejekegola.pdfIn PDF document text
    • http://buildinggodskingdom.com/webcms/file/35773082750.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/sjgcn4emodhkevmgi36dsohdj2/75869671249.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609460531cc3b---26079687988.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/76f7ccb1b2f6dea9578240f649357b8a/vufinexazegibidogomijawaf.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/04b94fdf8b00058c0cb1b37c8dfb3fe5/13007243492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=api+automation+testing+interview+questions+for+experiencedPDF 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_off0000e3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E1 16296 bytes
SHA-256: 238ca47021e45d13047e2241d954e1f5f0f2ffd28d055f5f40492b7584de7ed7
font_01_sfnt_off00010dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12616 11400 bytes
SHA-256: 3dcea5715f99f10cf082c9e2057a9ff56eb51cb9486b008c51a96741daa9f289

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