Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d8faf230f82c03…

MALICIOUS

PDF

72.9 KB Created: 2021-09-13 08:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f2cc4fd39f36e3f1aa8d3cc7b1ed6027 SHA-1: ca3f2999350c51f36710db0552f0c246c7abf0ab SHA-256: 49d8faf230f82c039fb4c196cf29eac7e289079699399f64466968f93209389a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while some are benign, are part of a larger pattern of suspicious link aggregation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613716cd6dc01---mojerikugar.pdf In PDF document text
    • http://thecountryclub32055.com/userimages/kejowuze.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210912235035.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/valojodizanoxuwejit.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/27342057842.pdfIn PDF document text
    • http://getvisa.ru/images/File/fogidi.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/gowofabipadododowufaduxoj.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/buwatilegumi.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/megunizekarilixofaku.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/0fbb1739e95a9538f2b7d34145ccc005/9185399693.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/nagikesirivan.pdfIn PDF document text
    • https://istanajp.com/contents/files/jironakumezokin.pdfIn PDF document text
    • https://insp.biz/img/file/ninotisirufidamajuba.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/34540810419.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/f72b3274bf937f7a783921a6ccf7eef9/wabutezuzi.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/66838907889.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/93642630602.pdfIn PDF document text
    • http://praguetransfer.com/files/file/libaxut.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e79751e5f6---nolifelalixuniki.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/e535350ee8404abdef27b4f46011d95f/dowujutanumotofen.pdfIn PDF document text
    • http://marketingnews.fr/images/file/jezofazininaguwoz.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/87507473858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+software+update+for+androidPDF 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_off0000b9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F4 16496 bytes
SHA-256: ed9bf2a9e2476c042eebbe4f67fcd8865bba29f6b3725f60b620e26d9f4f4249
font_01_sfnt_off0000e54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 10728 bytes
SHA-256: c6c52b7609ec72878873c635d1f0a9eb9f337dc0cae223a7f6ec3a87f296c101

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