Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4098be0797e9ac6…

MALICIOUS

PDF

82.9 KB Created: 2021-07-06 21:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6f37f78bba9d4279b0cc1ccb7a7bfa66 SHA-1: ab5a92d38567e34487801d53d5d4769c735f20ac SHA-256: e4098be0797e9ac6a2cee69f9cecf1b159a46535fe5c1a3fe58a2f96903469fe
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=long+on+top+short+on+sides+mens PDF link annotation
    • http://aksaaydinlatma.com/img/editor/image/file/gabikijufipapuxogimokozu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd24ae50d0---91274394438.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b8f3ee255---fegemiravakul.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089969e37dd6---9249047021.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/faa4e6cc8336d008e692759b7796983e/wikuwisidilejulev.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/38460edfcc0d552f7bed0eca84cc8e58/sizejizapewopiz.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/digobevapupetufavojeze.pdfIn PDF document text
    • http://weclassof86.com/clients/6/6d/6dc59c75684a9be5e3a4726337e2fa3a/File/guselof.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/73500671492.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///nazekanonap.pdfIn PDF document text
    • http://emannsltd.com/userfiles/vonipilefavumidugulemux.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/d965d3ec011ec78f8236a602f484285e/zozojufukapereje.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/dazonoparosu.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf53f86126---85977066162.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/moxabavilexomemipinakolav.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/89473352848.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/9e9306bab4025316546c2a4eb9b7ce7b/wewij.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/730312f6bd4032f9c4af6d9e42ef313d/9152275102.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/japopikukuvejadebaj.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/juxafozofinizatutodunid.pdfIn PDF document text
    • http://www.siposferenc.hu/html/molorerumaraxabaxet.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/nepajovifonu.pdfIn PDF document text
    • https://mmszke.hu/files/file/89776749254.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_off0000e3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 10588 bytes
SHA-256: fa0884b73691a22dddd86d254b629c362c99be53c85686a3e768b3720bb84778
font_01_sfnt_off0000fba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA5 15940 bytes
SHA-256: 7263d82453e1dcc949c6ef7431ce44e84d1fee0d656b4c4f064beea3c206145e
font_02_sfnt_off000124a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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