Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb611fcc2dd8539…

MALICIOUS

PDF

142.3 KB Created: 2021-06-25 20:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 061f41b7bd1c0d65a88b7bb9204edb71 SHA-1: 3b4e79e0373008fa17646cd46fde80911cab53a4 SHA-256: 1cb611fcc2dd853976291e3b7bfe575256e832e1fb827bee454f413b626f0bb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/oj09mjl5rng8977sfc2rvvqr39/32889034718.pdf In PDF document text
    • http://bluenanum.com/ckupload/files/xuzoxozo.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/atrgajdo7heu6olcbc1t2rvkaj/sarisatipiguvomujudit.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/58a933d3a132e48e9488aa9606639cdf/detejovoxibejajomasusu.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/f6ad56ef164c70623259a824ae8baf75/nikivotagiketipabuve.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/45bacb2914b1920acabe5166e00aba75/gimod.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3cb7b4c23---78016785879.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/49605468580.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/96874184522.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/befanabit.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/50687624433b8f49f564fefbff1e4c9b/gokulesatuduvelajoli.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/4763bebc728d2ef545dcc356c4519a08/81797593920.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/wixagevab.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/9a8e8a481a7a5f45ba27e64aede9f365/56373078216.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/xamogewozexabikutolitun.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210609164235_t875e0.pdfIn PDF document text
    • https://laser123.com/geektic/files/zabexobuzelulebaxuzi.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/kb94rq6cldb7l8fvqlq55nf3ui/wifidudebudapo.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16088c34e5eddd---wagajodudanexivomeseto.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a55d37d47---91555965722.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608974f3e22ef---90446957549.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95c74423ee---17540743011.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082060ed8d9f---49538448772.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/p62g0a4st4jbivcfq992tu2gp2/wesewesiwalenudoguxepun.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/fefe0c8b32b9dc0b0cea6a1ada1e5574/38328691848.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/metufin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=problem+book+in+relativity+and+gravitation+pdf+free+downloadPDF 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_off0001c602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001de14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE14 19580 bytes
SHA-256: 218a322d6559ff21c994ec5f8d3ded207d3b12c44b4e5d31b390d2ec5da383c7
font_02_sfnt_off00021117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21117 11172 bytes
SHA-256: ad090ceb9396fac9d8f527ab7660d38d0a589a3f33a922feb8f3d774bc00e3d0

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