Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8a8ab6ccfcbaab…

MALICIOUS

PDF

67.2 KB Created: 2021-09-08 13:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d1216c86ff9b6a0576cb7386effdeac SHA-1: 9f31d3645b335326ba788c4bf671936c0d487e08 SHA-256: dc8a8ab6ccfcbaab69b17458e5abd52ad9f6572da1f9d365aa6abce16e1ffda6
176 Risk Score

Malware Insights

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

This PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious content. The document's structure and heuristics indicate it's an image-based lure, likely hiding a clickable element to initiate the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161327be8e7d04---7452751761.pdf In PDF document text
    • http://benetalent.com/upload/files/45316217470.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/76920373368.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/28806905260.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/73079795229.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161312b371a792---puxeretuguxab.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/zewijide.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/fagenawumifuzufevixux.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/57983276689.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161338488cee3a---43198829319.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6cab3cae8df46dba51228f16fa2638a9/dabogi.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/28108409969.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/litixo.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/h7q0mavr3mf04he13p5c8uv9ie/mowisesexuboxoturenagoj.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/guguxebot.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210904094428.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19664983629.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/71507315398.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352ff49f382---mebufolozekuwokobegi.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/juxobituwideniverusaxe.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/87b53d839046d980f3e6d1e05795fa30/zoliwaxafukabosivulorolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=depression+scale+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_off0000ad0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD0E 14352 bytes
SHA-256: 41579b4e0b0fcd3b07a4fad43fdccd3350f2f51cebe15e7624a21a68fe52ba8e
font_01_sfnt_off0000cfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FF 10516 bytes
SHA-256: 160cbde5af57a3f30845d90a738539a903d48f47a0e2e702084e7db88a6bda20

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