Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c4c97c09604cea…

MALICIOUS

PDF

83.6 KB Created: 2021-07-30 05:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c37b95773c5fd4ecbb4eaa0c2c81f95a SHA-1: 5c4617cc0afeea0279a8b0587530a37e43778655 SHA-256: 37c4c97c09604ceaf905ebcbfff0105e9ea5299943778c485886c62bfe6d5440
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the URL structure itself is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081d4876694e---49580760670.pdf In PDF document text
    • https://alakharia.com/public_html/userfiles/file/49829786676.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/perazotigemunasanikew.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/joridivufoxovano.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a538a941f51---22183737343.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021052425645_347788393.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/57341190424.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb206f29e7b---78160255723.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/sakofokimoxetegufizeli.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/30331109040.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/2843866581.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/bedawaxerafunima.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddded8a866---38505708814.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/c84d253aaefeecf3dd5757c1ff037cf6/88867563594.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/diguzoxi.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c22f04e0b05f39a7ac9c6ee3e7656992/jafawitimadegu.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/82901466721.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/90a40f9283f7c50d7a948a545afa6bc6/vofadovoxikifijowa.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/37b6ab81c7fbfb9b3afb7bfcd23a4979/kepajelukibekiwoboxi.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d39e264d5a---82939841657.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/59924632878.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/lugefoseponuzepasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=milady+chapter+20+test+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_off0000e210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA22 17228 bytes
SHA-256: 92179f699b8996a37e7f41b5a24fb40100715fd5b9a89653d1990af49865115a
font_02_sfnt_off0001276e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276E 10844 bytes
SHA-256: 25a631505d651deff1621983ba8b661b4e6b39cc9ec5d6f7a86d4b392d339bc2

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