Malicious PDF — malware analysis report

Static analysis result for SHA-256 da59401762d330a2…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 03:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 42cdc3eabe113b1437f1a2f927125ac9 SHA-1: f88d8e111d9768ff864ddaa2cae5457f5ddc0aac SHA-256: da59401762d330a22e7801096746c62d7290cc2e60b5998ab079a43232aea170
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through a link farm. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ee4ec03913e4bb370e40adbc6d85e660/99862556848.pdf In PDF document text
    • http://pzhjintai.com/upload/files/besimakofojixovofumemeke.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/37119653866.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bepinamus.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/90lbilk8i20fand0j1btervlkf/65354876026.pdfIn PDF document text
    • https://asiahijau.com/contents//files/bavovozibedaxi.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/wazokil.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/uwedazijuvedinope.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0ac256a7888ae96fec4f4d27d5c4e5d6/98326334788.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160805090e8762---24382414333.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/16353682850.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/2876c4f9cfeerpo8eubkmjoae9/34621187303.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/titezarimuvez.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/92877f1308aff558eaac2b1639c4afdd/91518328957.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e6693207a---rufifusowevexa.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/78604214868.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d55d1fd11e7---12039865773.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/kagoguzuwagukumos.pdfIn PDF document text
    • https://ancoraeducacion.com/images/ginelerufimunofizip.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160bac8a6b0334---1847526667.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/vogiritobivesozedonugemu.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/surulufigilok.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca8b8aa143---biwut.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/f8d66381cb9091bab7089b0d5c0dc571/wipifaxovarik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=applications+of+ad+hoc+wireless+networksPDF 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_off0000bc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC86 10876 bytes
SHA-256: 39f2796653189bfe1256279c7ce67e098fb6ff183b18bade06c857c090d0f9eb
font_01_sfnt_off0000d5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B4 16232 bytes
SHA-256: b86c293d4ab6f14c0f3ba786ffe6442d5dc104f70caec54b1c40cea43102de98
font_02_sfnt_off0000ff69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1