Malicious PDF — malware analysis report

Static analysis result for SHA-256 444cfecfd27b7b0f…

MALICIOUS

PDF

72.1 KB Created: 2021-09-02 23:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 234d6244bb6d20b60c6ea3671d32a4b8 SHA-1: 513a2761789c00e296e84e6c8450a2354f9ad8a1 SHA-256: 444cfecfd27b7b0f108d795e5bc8a0162e57d1cbfc9321865578d023650b5925
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous unknown URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an exploit or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bombapin.com/calisma2/files/uploads/zijemafajobofodalenefidu.pdf In PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/gonotitobabow.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/29222004160.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/widepegone.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/nageko.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111cb7b92374---14131084282.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d6f373f79---84227852400.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/caa07df6ddc030cec60e0f18f2b57a5d/77987320590.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/5133616352.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/jodolidokajoju.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/febonibasitozotinegarasa.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/49193666055.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/jatajo.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/68143112554.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/rarunireje.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef3f22a14---11605526691.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/59597196525.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609834021ab56---savetivokatedulowo.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/7781005938.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/hpsgj3v7b22ans3131j1nu8u3v/fuwelutadaxosefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=merlin+gerin+circuit+breaker+manualPDF 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_off0000b859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB859 16516 bytes
SHA-256: a9eb63c9e01b4fcf6f1279e82e5331de7145745c65fe1e94d5eaab2a1dc24d7d
font_01_sfnt_off0000e30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 10612 bytes
SHA-256: b92a86fd4943c85ab7d91d30f4afe6ee80a8f40f42f28eaa96f43da3c9f34f44

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