Malicious PDF — malware analysis report

Static analysis result for SHA-256 33340b5c7a107352…

MALICIOUS

PDF

82.8 KB Created: 2021-07-18 16:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 721225df6bb10dbc0c3dabade70e8965 SHA-1: 46bf76bbd92671c60dd8459bf9ccf0fad7a0afcc SHA-256: 33340b5c7a1073522486297de87a082db2653ea4f5df3cc00ed9f70854d25eb3
164 Risk Score

Malware Insights

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

The sample is a malicious PDF, as indicated by ML classification and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF's structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gwtcs.org/Content/uploads/files/zikofolikisujukuvuxegoset.pdf In PDF document text
    • http://criollo-cocoa.com/userfiles/file/jibufo.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/33272139425.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/bowibupaxisivoramaratopa.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/taitn3qrvguqhplkdoqd2pc7i1/42988977194.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ac28a7801---zisuluwuripusevekujoxe.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/30763957965.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210527214500.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2c01aaf7a5b101806966a79b151cc66/vamiguxi.pdfIn PDF document text
    • http://pk.mo/userfiles/file/somotigusujatutu.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16075be2929666---53829489794.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/23405220832.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160821a088bc0e---jariwonelexuxanabejufabi.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/reui5er1iu3q3vq3lr4r24qn70/37297134082.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/54902998725.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16096323506421---kanigekizatusepusito.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/madug.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/retafofovapudusixexut.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0d0677d70---92715892616.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c371917d116---lugatu.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/mirorubujomuroxefibum.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a2f70ec6---58721950836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=eur+to+mxn+exchange+ratePDF 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_off0000e222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE222 16808 bytes
SHA-256: ceea5855b7bc0a0610e5d231cdfefa0e9ae43fbb53df8f3730d879908c7162d5
font_01_sfnt_off00010df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12609 10556 bytes
SHA-256: a2ef26bce06ed955ea9e30ff5629f87f7a507cf5e0324c279ac53058121b483c

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