Malicious PDF — malware analysis report

Static analysis result for SHA-256 d234ae3b05b1bd5d…

MALICIOUS

PDF

73.5 KB Created: 2021-10-08 22:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 442cab022f91659c26fc55270e52ba60 SHA-1: 9b21d9fe10e4ac36f2415062cb3fd086c145f770 SHA-256: d234ae3b05b1bd5d7dac2337c5ce792a55efc873e4e3ad919bdf5d7f0effecbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm hosted on compromised WordPress sites, designed to redirect users to various PDF files. The presence of multiple unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest this is likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153b4722f96c---28212368280.pdf In PDF document text
    • http://jamalcar.com/userfiles/file/govaporad.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614735651f739---niwifizofemirezuwirov.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16155c2dc27de1---71565543350.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/zavubilipitijugefajuxo.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/sugage.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/832513233.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/96r08egvpitvg8lhpuaqftroh6/19426279224.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/41816923237.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/34702817894.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/namobogiwakizulew.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/13377066914.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/53028022022.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/rutuve.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///36399149853.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/21261724073.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/38030946216.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/pafoviz.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1615a493648f67---rivutatatifafovizu.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/77863315177.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/lixosidozufuzenonokin.pdfIn PDF document text
    • http://vo23.ru/upload/file/fisufatetep.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/moluzomanokifatekuwovaf.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/16238466171.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/6717181809.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/kegafuxon.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/zujuxojo.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/sedupebono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+can+we+hack+pubg+mobilePDF 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_off0000beed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 15884 bytes
SHA-256: a5bd1a3e60bfed08b02e81f8a66b3ffe256343ec505d480021a57b513c6f6d41
font_02_sfnt_off0000ff89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 10864 bytes
SHA-256: c4be1ce72e2065fdf9e06fc4b97e4cda5bdc408c5fd5c4c785bc70eb86829f6b

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