Malicious PDF — malware analysis report

Static analysis result for SHA-256 137982978378903b…

MALICIOUS

PDF

77.5 KB Created: 2021-09-07 15:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 42f3f39ff49cb01eb20502c4ae4dec4a SHA-1: eb127678db1e3ed04938deed91d2b605e1cdaa0c SHA-256: 137982978378903b624cd805bc7e9b4e4fa64096c7775c44b1a4b42dc6403cf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate effort to obscure the true destination through link manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 https://crewmak.ru/uplcv?utm_term=become+the+force+book+pdf PDF link annotation
    • http://anbao.vn/uploads/userfiles/file/juzipokizoseterozu.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079ffcf80568---fuvoxilurepiburud.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e645d53da---46860313656.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/saguwuvixaziferomiguwuk.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16115a52ea111d---77302526393.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/tuzutopipige.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/g45tvq8qagoc2a11sum1jmi83k/73135541375.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/99561441361.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210714140733_1701788498.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/voxulemuwaju.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2905be281---lijibokitudamekube.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/da8c20549899284e1ea4190d8f86ee29/73477671551.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/31079300479.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/51481603032.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/zojajaxuguz.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610eb1cbbaf14---lojiwen.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/62096832804.pdfIn PDF document text
    • http://glttek.com/userfiles/file/nifozodawovodubibubuga.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/22340524376.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/57531133998.pdfIn PDF document text
    • https://triosms.com/userfiles/file/vukuposinodogimujigutel.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/tabibelijefozelujuxawaki.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/30dda2727600ea0d97ab397232daa9b2/76638351873.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/94182472203.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce89a674ef---narigagajosapinixawenolis.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/9421443783.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/fakubedenapibujodap.pdfIn PDF document text
    • 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_off0000ca70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA70 10596 bytes
SHA-256: bf7f18bf1143dc950d8ddc92bee78f1f1ba16fef177aa14e8a898c30f8fb4f0f
font_01_sfnt_off0000e26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7F 17728 bytes
SHA-256: 208bf8df767c5542dea699142e453470ae6df1ef757edb380ed965442fab217e

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