Malicious PDF — malware analysis report

Static analysis result for SHA-256 169e0dd259d030e4…

MALICIOUS

PDF

90.7 KB Created: 2021-07-24 03:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6a5563537c90b38f44589c92249c2404 SHA-1: 5275056aa6f8277baa830654fce25483c112627c SHA-256: 169e0dd259d030e45013825d2b3514db4c4676a7f8bd217fb5b859126bc70026
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or manipulate search engine results. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/3d3abcda320db24db6256a8d36c9e033/5582680866.pdf In PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/bd9dd428b91d3e7843f2cfd1bcd2b5ab/90392002911.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/tagufexanu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4c1f7d03a7e9dcc166f8b4800d5d3920/mawoxesivadudenowogiduvi.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/38fa6e60b88b382eb55d198cbfec08cb/lerewure.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed63f346c4d---wenutib.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e124de05960acff42a8df3895e388501/52011226012.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/jofawasomagomadasim.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/4eqq7e7vshs6revp9q4jbvpve0/69037731274.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc9586ab4cf---moduzuguwojumosojijisenax.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/vulujepif.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c7028cec00f---bojejekojufut.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/i706v3coeh4liqsvohvt97a5gc/mawogifezak.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/kudowolaxetumilovu.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/gemuwelawatupenu.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/gupedawusawirijubase.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/55392015156.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/uvhut49nteu2bh79rc36mg4tde/39314037444.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9f3035ba---pirogovemegoxe.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/7585873746.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/d0c722908e115e822375341bcd1598b0/ridis.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/kurajovopemugo.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/pukosira.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/lorizupusasikarodopiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=climate+diagram+biomesPDF 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_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 16904 bytes
SHA-256: 696b276fc2c44fd252af7fb862a91674ea21bc4fbbd2a4380d60c4853169157f
font_01_sfnt_off00012c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C49 10656 bytes
SHA-256: 81cf19e2067d7ea4bdd5095808baaa8f9f170ab8692cf171e2d7c8beff00b09b
font_02_sfnt_off00014477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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