Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c8f9720ab4a999…

MALICIOUS

PDF

131.3 KB Created: 2021-07-01 00:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ca343f94e284acb631b84d8c9a242bdb SHA-1: 1458d632f8528091851857ea3d543bee0c180a15 SHA-256: 56c8f9720ab4a999ba2cef1ce1b5a4f9237faff88772df0346e3c237caee6a42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links, many pointing to compromised CMS uploads and link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://infrive.ru/uplcv?utm_term=mickey+mouse+donald+the+frog+prince', are likely used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://infrive.ru/uplcv?utm_term=mickey+mouse+donald+the+frog+prince PDF link annotation
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/5uuqvdsj13jeu59jph44fi5rro/30526145306.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609710a64d945---36619801070.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/bakakenaxujeb.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/igfsh0n4vhbso39ir7aknfh6n2/pofezukonibupo.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/6995285141.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/99206750136.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc98c7586c---46676664733.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/14c2bbc2ee128a08380a3d4cf27c1469/foxinezapomupozidafuxex.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f032057fd7---kunovogod.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/4e9d36c6cb6b4a431485e28f834705a8/jomisamimejuv.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/gebatap.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/peridoligojox.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b95052d5828---kanebubef.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/bc278f79722d5c1e329e2cbb68215506/linazukudosunoxepagil.pdfIn PDF document text
    • https://yellowstonewildlife.com/lamibelevegorote.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786249d8d31---79513578016.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/46636476911.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6ec648f2e---xudibit.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078a1de7ab37---sofozedodunibajonuku.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/44210424152.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e695ab231d469f5f01be2aee75ee79d6/tokenojasuzuwufidurig.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cdb9da1e4---98384355012.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/3d5db32ac361b694dd076545aa73e517/35063444324.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/60114017156.pdfIn PDF document text
    • 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_off00019efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EFD 17620 bytes
SHA-256: 6139eb48b560064c708d12675bca8017c4c190a2f7f325871056d555ae321e2d
font_01_sfnt_off0001cd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E53E 11368 bytes
SHA-256: ec3d38b15173d598a03574304b95d97fbcc3c0e90bcae342084aeb0f8290f4ad

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