Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca3de1b3f351ab1…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 00:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dbf3fd33047a6198d29673c5af049227 SHA-1: 0c6ccd8d36a49b842a41909d2847062cce35d0be SHA-256: bca3de1b3f351ab14af62bf3f41c14990ee9dfeb621d99c50c67e706f47eb14a
96 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 and appear to be part of a link farm designed to attract traffic. The ML classifier strongly indicates maliciousness, and the presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the attack pattern. No scripts were extracted, but the overall structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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://domusanna.it/userfiles/files/wafototajukuloxi.pdf In PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1739ccabbe---goxaxamarojivesa.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/83359925261.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160857875badb4---3272411101.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/66835314266.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/02730758f48bd4753d6f0d22fa77834c/judorefugadatupemogexawod.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/11506625853.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/c55f4ee20fc15f2eba56fadc5fb1ea86/tenogol.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/lomixufito.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/gupapaveva.pdfIn PDF document text
    • http://fairmonteast1969.com/clients/876766/File/84584198113.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/mugusogil.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/86884032238.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5322b852b66fa1b608f3ab45e9bd09d2/tozefijowiradanixudaruta.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021070805264743.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081be0f1ea39---xizogowifodoritago.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/rivowaxaxuwures.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/67107506781.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/nobomulojelideju.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/43249032664.pdfIn PDF document text
    • http://cosmik-kino.ru/sadm_files/65706289089.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/pukezo.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/45766353242.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/bd6fe87804789f414e490fb1f63c1f8b/50847113464.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/wibuginojisur.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/mobobakazadomadoteg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=stampa+fronte+e+retro+pdf+macPDF 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_off0000dddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDD 10552 bytes
SHA-256: d6ebcf22ca72104f788c70901b8657d33df9c803ce5323e005f223c73c829d84
font_01_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 17316 bytes
SHA-256: 702d52ab1c6d4a5209713f5147f185dc4b3eab5414996b627b1d1cbb09cc75d7
font_02_sfnt_off0001232a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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