Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ffe021ccf860af5…

MALICIOUS

PDF

86.1 KB Created: 2021-07-20 17:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad57f5191e70073ced571e5e65b2d508 SHA-1: a97a8dbd1052a9e9772ead0b7b5f7478a10238c6 SHA-256: 3ffe021ccf860af51f20eea65850973530ae0013d33f96d8fa9028d52a598e82
164 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting it attempts to redirect users to download malicious files. The presence of urgency language further supports a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099440d878d3---85404863934.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609687f0e5a56---bisavejivoxasigefilofed.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ac7ef3354---28726560279.pdf
    • http://sb-78.ru/files/file/rozapemujofe.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e3c6243a0---48793259789.pdf
    • http://lapenya.cat/imgjovesnaves/file/88742053375.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16071af5e9507e---bidufalepawixofubowexepo.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083f14c4c947---80336771616.pdf
    • http://icmasistemas.com/userfiles/files/49190854343.pdf
    • http://www.sport-konyv.hu/userfiles/file/85602623338.pdf
    • https://ajitcoatings.com/uploads/kafopafoberonubolekuk.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/0u9dm6tmc4jiqv6659lt10lvh0/podas.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609743eb435f4---45372487277.pdf
    • http://alexlunacoach.com/img/editor/file/mokirokudexabu.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/cbcbf684c3e241c9a46a56d2fc9998d3/zozogixegaruzigukuvuponu.pdf
    • http://clearspace-design.com/CKEdit/upload/files/50208819287.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/c39fcc24d5d715196d3c095552d1ffe0/lodidufi.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f2ab244fd---56323048746.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b8f16a2e7---tenijogugorug.pdf
    • http://aivieksteslaivas.lv/userfiles/file/83967258543.pdf
    • https://cristalensi.com/public/File/25048948318.pdf
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/jirubewatura.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba1a9910b0---1779666656.pdf
    • https://belhasasecurity.com/userfiles/file/sewajegefamisi.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/bananuvole.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=defrosting+ground+beef+in+the+microwave
    • 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_off0000e9b4.bin
b8056c883abe8b36151d120d23b9399fa92208dbae6d209c8d55942732f59372
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 11268 bytes
font_01_sfnt_off000103e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 16792 bytes
font_02_sfnt_off00011bf4.bin
365a3846778129b739b52df1aff13e15c24489c390dba94602362ce05484cfda
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 17540 bytes