Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa6b58a0f2e01d7…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 05:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8af1972a088f1b206550a150526ffd0c SHA-1: 1123f07a7aa696e7cf704b1d86c12e0a93fbb7d1 SHA-256: caa6b58a0f2e01d72dc89b68c642db2c804ae499a6448cf541cc9db30ed22c7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, a common technique for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613494019dcf5---55356271731.pdf In PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/rinedupevelakepuruxosuva.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/modagotarid.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/22929753029.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/xedoguvowojov.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/1545715726.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/legetobosolo.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/25156340404.pdfIn PDF document text
    • https://invision.buzyhub.com/files/ropuxuxafujilug.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/49337018003.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/vesuvogupexiruwedewiwugu.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/nivodepawurolowezu.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/93607892485.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/sufefakutawefubilurivin.pdfIn PDF document text
    • http://artio.pl/files/files/51751253535.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec17f043ca---45841233082.pdfIn PDF document text
    • http://watch62.ru/files/files/pafawalojobekivob.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/47295578295.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/fonuforijagazupigo.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/pizebe.pdfIn PDF document text
    • https://maria-galland.ru/files/file/kafadixuwowameli.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/88161749381.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/17532762546.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/48bad8048f12a69fb46df8537407dcdb/81906537810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+see+who+viewed+profile+on+instagramPDF 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_off0000d794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD794 11088 bytes
SHA-256: 60c580d0d3196d505f7d5cae2963deed1d73c08d446d8c6a71f30c599f9712c8
font_01_sfnt_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 17484 bytes
SHA-256: 6719dbdb347633c0887f14d7ab924a42e0f701798e5439433b4662e8df8a23e3
font_02_sfnt_off00011df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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