Malicious PDF — malware analysis report

Static analysis result for SHA-256 237a012ccd582fe3…

MALICIOUS

PDF

94.3 KB Created: 2021-06-26 17:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 770a7403f27033e7a9b687dcb5bb7b14 SHA-1: 0c1390464f82c01661e5b5d9ff539306257e1cd1 SHA-256: 237a012ccd582fe39474a1af4bf2b824dd134a08d3ac9c9949704d92788ae0b2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and a machine learning classifier, with multiple heuristics indicating it is a link farm pointing to compromised WordPress sites and potentially disposable hosting. The embedded URLs, including one pointing to a raw IP address, suggest an attempt to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pphu-joanna.pl/fckpliki/file/vobenizegijedegadabajapa.pdf In PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a152cfd025e---88726818862.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/85852585061.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/65390030231.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/98352a4e52e7555392e20f708cad6176/61481978540.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/xikusoxifuxusamogisura.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/a435ea0938087db5a6492699211f8671/82921172108.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9b4f962fa844a7be41043add5f86aae/fojogofisojovakeneduf.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b32c5f6353a---70978467886.pdfPDF link annotation
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609441669acfa---71252247623.pdfIn PDF document text
    • https://susta.vn/userfiles/file/vitivuledatejunukilitubuk.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/53423781918.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b1b96dc5---tivetanogofubuvolup.pdfIn PDF document text
    • https://aspirans.com/files/file/napijazegonaxufupemimaf.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16070c21180298---wojigoderafapirilikevido.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/62266905252.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4f744a22aa7dbe88f06c70e2a8f2c543/xuturusegepegalu.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/cgchd90t9frcd16vob4pdeciv5/dotuvejejefiges.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/77572813333.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/xepowawumaz.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/3136731908.pdfIn PDF document text
    • http://fitviewer.de/files/file/muxavepopidanobudes.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/76899fea793b278db5e9eb0c2c13efb7/48790235295.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93a48b41b5---nupixin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=beta+decay+reaction+equationPDF 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_off00010dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD7 16976 bytes
SHA-256: 0569175c249f30b50ada3d1d9890cd12cb98b3ac14508e6be30cfabccc2b2d4a
font_01_sfnt_off00013a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15274 10560 bytes
SHA-256: 682c59a991312b482855c77d163b99138b7f4038c05aef29ca7ccfef18543e2b

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