Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ffabba58f3faaf…

MALICIOUS

PDF

78.4 KB Created: 2021-09-09 14:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 222e7ef6c263c8908043e64750dd3007 SHA-1: f4e30a866d17da9c0b050b93d85a34e93bbc0715 SHA-256: 95ffabba58f3faafdb3bded72c652b6a155fc02f2a1a11b79641766583fa9e46
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links pointing to other PDFs hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • 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 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.
  • 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 http://carraracucinecomponibilitrapani.it/userfiles/files/barisifovopelelatewetave.pdf In PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/guzoxaporinozemara.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/70141377103.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399e2321a63---bukusegotome.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/xorirademo.pdfIn PDF document text
    • http://jawarakreasi.com/file/pafej.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/87486067111.pdfIn PDF document text
    • http://beta-rc.com/upload/files/vajuwikolozunozug.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/miwububixipojovewitaro.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/1715688420.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/dib9od66jjaclpm3huhd4hvptu/30732225264.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///fawajebisajevamo.pdfIn PDF document text
    • https://koratspring.com/upload/file/36098476564.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161319b4ce58ec---83774264119.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/91371995697.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/rewelamijozoremoride.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ec133ea22---vazofajixut.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/94825428784.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210905090633.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/gutilibovawuritosusig.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f54a157bad---zojafile.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/46758432998.pdfIn PDF document text
    • http://hodori247.com/uploads/files/64219940436.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/69671209363.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/2350233236.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/lomesobubopuworeju.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a80ee54b7---25317853731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=polomolok+postal+codePDF 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_off0000cdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E9 17632 bytes
SHA-256: b00f1579568aa0947e3832eec34ef1a9722c349059a2940d38fcb33b081ddc29
font_02_sfnt_off000113b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B0 10472 bytes
SHA-256: 882aaa2468554af5347241bf8da318e3cd5b4cb84ab78455bdf3ac4ab2a592da

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