Malicious PDF — malware analysis report

Static analysis result for SHA-256 41374d7f24323d58…

MALICIOUS

PDF

74.5 KB Created: 2021-09-14 06:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 93565fec45bb2e23bd3959fbe1045016 SHA-1: 3fd9927a78d2d9ea913326577e7c7bc01d34fd61 SHA-256: 41374d7f24323d5857c5a87c89136032638147b96a07b82c18bc45811369a649
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or utilize disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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 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.
  • 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://stthomasorthodoxchurchsouthpampady.com/userfiles/file/79486027076.pdf In PDF document text
    • http://mobilahomedesign.com/userfiles/files/kazusosolasoke.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/labigakaziteluvemipi.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/41817199606.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/mebosevibirig.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/59524086149.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613886d44dae6---74559140314.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d67e9147cd---26621792434.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/87244701833.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090219575978.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da56f37391---46802664230.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/859633030.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b629a0f4c9---riwawupibog.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/vojul.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/vodejijolofofotikakin.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4bbf0485aeeda09db8f4314b1bc3c983/genosifagaxesotu.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/poxuzusawesugafimazed.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/xefivulukosaxexolo.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/33395942737.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/zunusuxudegabamewo.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/7ff9f7b2996b56abd2e75a78c8110eac/xukejavumuji.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/9380189702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=minecraft+td+unblockedPDF 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_off0000c0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BC 10624 bytes
SHA-256: 49c5d1fc25d7d80ab7ea69f5898545df7c1e3331a4e9b51099a1eec28c6a6979
font_01_sfnt_off0000d91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91D 16860 bytes
SHA-256: 8c5911ee8a8bb5b3d30228bb5e544e801c59f4d5a38b083d55ff71f2d8353de5
font_02_sfnt_off000104d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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