Malicious PDF — malware analysis report

Static analysis result for SHA-256 fefed9e176473bf0…

MALICIOUS

PDF

84.3 KB Created: 2021-07-08 04:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb21b2e66998433b543d43cdefabff88 SHA-1: 438656522c9fe7c08d20cd8fd55ba654a6a00866 SHA-256: fefed9e176473bf09d12a312b3ff1538a941b9c2073bf0c26872a0a4546ca1aa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a phishing or trojan payload. No scripts were extracted, but the heuristic firings indicate the primary attack pattern is a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://msamerica.net/clients/873634/File/27090284310.pdf In PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ecbaf278010a348ca1165ff2180bb3d8/nafemopujejirubotopur.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/suniwinejuzufo.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/j93f345mn0t3jcor8g4672kv49/lukovoti.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/69517719918.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/sopabadijerabuliladogeva.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16079bd890b522---73271080085.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/mifodezetorafoluzo.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/3f70d7f8db77baf770ae78f97c38010c/41044904202.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/tofakevulanoweze.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ac5c35de8---26931869247.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8317912077.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/megitujonarekipolesuvone.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd939d1210---zurasizixupu.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/bivejigawojozomu.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607766475ebc3---60041354014.pdfIn PDF document text
    • http://toyotalongbien.org/data/dulieu/files/55737446012.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/bazimife.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/bbfbdd607b60356755a560ca9f467b64/tudisipewopajewegabosonan.pdfIn PDF document text
    • https://basisnomor.com/contents//files/26896804926.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba38ada2860---gumamo.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a6c2a6f5a---59745160817.pdfIn PDF document text
    • http://domplus.su/userfiles/files/kogudizodavuwuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=procrastination+on+your+part+does+notPDF 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_off0000e78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 17092 bytes
SHA-256: 7ec9602d09bf5f4917a401b9fa9332f57fb7ad41909aa7d9e898933f7785b88a
font_01_sfnt_off0001140f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C26 10676 bytes
SHA-256: a3ca22bd81090cd3d377130ef2e72c898a21b1f7a23477fa28fe8c3fa1eafba1

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