Malicious PDF — malware analysis report

Static analysis result for SHA-256 466cea99bbd7e4e5…

MALICIOUS

PDF

82.6 KB Created: 2021-07-20 07:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b4389f4a4cad0e37aefa9c5d6f9d15c1 SHA-1: 40f55f6b944cee0d7cf832a9bc927bc1fa589811 SHA-256: 466cea99bbd7e4e5a3bc8a20ec9ff627a4eb72d8180981ca70c9fe640b2e6509
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host or distribute malicious payloads. The presence of numerous unknown URLs associated with these compromised sites indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://weilaimachinery.com/userfiles/files/fizuzokelovexoduwijesuf.pdf In PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160723a1f3d6c4---97618322095.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077be1e5a049---63128127090.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/zofiletebujijibu.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb4f8ed8d3---kowijovizabomawuzaretupez.pdfIn PDF document text
    • http://charontrade.hu/data/file/fuxijemizigumenepinema.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5b60c570d---49523540959.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/juvufajevido.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/6ea296a1acac5c2cad10db3ed69099bb/66832199976.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/wubetu.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/a6e58616985d20057d63625f942305b5/42076899333.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/2260ddbb2667807606142b9bdc350cae/89165679399.pdfIn PDF document text
    • http://blueyee.com/upload/file/181822291694.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c779e40f7---45741203632.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/82675290127.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ca9ea2edf7581d5096b83a021cabd59a/fojidesa.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7daf35e3---42677812514.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210617200636807099rarsn.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/rediloxewibusudinal.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/gajukatasavewadujuj.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/fo0u3url1uv80q3tjgpsqmub21/10113124542.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/81366934266.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2b09a07fcaad2f0d42969e194bec6b86/40238960856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=m+laxmikant+indian+polity+mcq+book+pdfPDF 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_off0000db06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB06 17920 bytes
SHA-256: fb61ed7a906884380cb7d061e718c90db1b3b65fe222b0a5948791a580ff8e72
font_01_sfnt_off00010a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A44 10968 bytes
SHA-256: dd0c3d44ccb7db130dd6798b2ecfd9fb74979030dce4d5f5c30079b7bc10e5be
font_02_sfnt_off0001233a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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