Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d6a777141a9ab7…

MALICIOUS

PDF

81.4 KB Created: 2021-06-28 07:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cd99a3309943961b84eb4ede2e736a7c SHA-1: d153063d8279c9e3333a327cdbf71e07f85211ab SHA-256: b7d6a777141a9ab7ef32b24d8ed102f98770985d44947a7494dba437b7555869
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to manipulate search engine results or phish users. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://abacusnancy.com/userfiles/file/mepepamivunixozotilapod.pdf In PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/4279830260.pdfIn PDF document text
    • http://attlas.center/userfiles/file/10565152404.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/lut3622d0ae3f1a3m99fofosla/bidedidexumil.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210620_83C6CD7F4F2D2AC9.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c3d7cf624a64d92031ff9e24462cda4f/sovidolokizovetilejiwig.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/zeluvamuzidig.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/gle7j5r8em8o95k3hrh0o2q0d0/jaduwafiximima.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c428ec618bd---77864878462.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/00a0822040eb2f54a6158b085dd783df/gelijagabibixivakel.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/fc87e9f11028b8c78bf9108250b94d4a/28102459172.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/dbc2dfght3ie2v8v5f8bt7h7s6/vixebibuvezal.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b42b796de28---16922511506.pdfIn PDF document text
    • http://bjjiffy.com/upload/tarubumedukopolibalitos.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f83a8906ab---zavukedozememuxajojapoz.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/movarinogujo.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/tif9o4bfvuj7e2iq93vf0r93q2/93719773624.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3eeefaabcd---28330756991.pdfIn PDF document text
    • http://susutour.com/userfile/file/98710443951.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dmkrurc0ukn26lmcvfrku0v8lg/famavezewupalimaw.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/veripodokerorib.pdfIn PDF document text
    • https://yellowstonewildlife.com/21621326913.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/tumovezowutekivi.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210618171827121185977.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98f333c07d---kedamaxudibafumufuwenila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=plus+one+physics+chapter+wise+questions+and+answers+downloadPDF 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_off0000d934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 11060 bytes
SHA-256: b4df7a57904e3b62b9009a3a70a488266a2a483e9ee77e7e92a3dac3094df742
font_02_sfnt_off00010ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE7 17184 bytes
SHA-256: 2927cb6d00f2399d8a107aaed2f320885235a3e2d44bd5f4a977bcbdc6c6bb89