Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03552b7a6f7f5aa…

MALICIOUS

PDF

86.2 KB Created: 2021-09-03 15:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f87b3c5059610a5b058886ebcf03b75f SHA-1: b009493b9e22b70407b66e9a5dc495f9caaf12a5 SHA-256: a03552b7a6f7f5aa907e8b2b9fa9a5fb2559255e966b7933de3fcc969bd6653d
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=material+design+pdf+download PDF link annotation
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e822dc934d---xerikunuguwamuvusego.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/79555265783.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/vojamusifuwo.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/cc9f1735eaebfde89ec28534fce47486/moninirofaxujewaxosape.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1610f60642dec6---95480158288.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf01653b3f---niberorikuxal.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/99c5554e9b8a24b35d8d56d43e480b60/watiteti.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/88488314654.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/27430120966.pdfIn PDF document text
    • http://esteel.my/userfiles/file/49455992450.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/dalamigajawigezevotip.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c777e7b15e---98390587570.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/64489190053.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b2802c07607ce1d728fb80f8bca04655/52415063549.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ae9924cbc48a78d8fdc46e6a9b5bcd44/wonag.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/33637863422.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cadf5bae590---23291216756.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/xujexarik.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925eb018c9f---kamepaxojopetipo.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/saruvoguwafuxoguxodarerer.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/43e4ae4f9b75336aa1989cfa86d9e8c0/komosove.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/9698310567.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3ff5bcf3c4bd049f20e87d8b7c852f4b/jukaxifurudojeb.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/31fe50826b9f4387aad4622cc4629d00/saborifutigotiriviw.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2df2c626f6961fd9e9f016bbb8b18eb2/88266605031.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/tg5i8p0orrnmttkkdq8gr6aefa/lonut.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/31dbf473769221d4edf9dfff16e1cb28/kebanibafik.pdfIn PDF document text
    • 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_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FC 10752 bytes
SHA-256: b532780991b509ce41c6efad338bb9632a8065cccbb8b59013b2a0448dc82ca2
font_02_sfnt_off000119a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A6 18592 bytes
SHA-256: fc2afdf876b6b7f19c4042bebe5ec1ad7d443a5e86a9818a639ef555c09a1f55

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