Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc529c526d3f03d0…

MALICIOUS

PDF

96.2 KB Created: 2021-09-08 00:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a18b16e36cd35646a1a7ffd33733d5ed SHA-1: 880a2081a6aea0a864be844a91a2a39e60a5e427 SHA-256: cc529c526d3f03d089d50dcf4d94c53593d2092d6c52bb4167a6b5261719e431
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 https://kimtuong.vn/isc/public/files/fckupload/file/89678623376.pdf In PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16084390087ad3---lazivivuk.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/63070190786.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/lojefaxakobisa.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/30533452429.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/19759210796.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/bumelajufukenaka.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/71293960333.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/2361661bef6aced7c6f31d32670c121c/rufav.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/zozavivajagunavazima.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/u5lkgereotvh8miacrlb2es8o7/deverotek.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/0oood7atp36qk536m63d7odmdt/42155142588.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/24275098250.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607626fa55d24---28913970324.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/zetulovi.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/vevuwunadadirepuweku.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b91b87f81b---56837345614.pdfIn PDF document text
    • http://holzbau-napetschnig.at/13198354957.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/27247871622.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fab40d87d---lujovilubutunopozojaru.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/78715866151.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607446bf02ad5---rateropuzipelotapekata.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/7759cf057e350cd171b54ad999e21bdc/80159404713.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1cb12f3d4---pipaloxuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=whirlpool+ice+maker+gi15ndxzs+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 19572 bytes
SHA-256: e5b28960263a1310778309a759a9bca385400dbafca6cac4b3d5f7ca11f28cd2
font_01_sfnt_off000124ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EE 16888 bytes
SHA-256: e0db869ba4a56687105daad72c93d407cd70ec116bb121dce946df5b3d9753bd
font_02_sfnt_off00013d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15591 11396 bytes
SHA-256: 1244df6876a757ca3144e97c9bc1b1a754fb0106835e61178627c4ecb2754e4c

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