Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f58276259198a6…

MALICIOUS

PDF

84.4 KB Created: 2021-09-21 20:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e537aac18a209e68d029b04ae82df661 SHA-1: 54fee1348d503ee61ea41f3eb93d944415a11e99 SHA-256: 82f58276259198a6b6bad34717711fd3d1ac86691b229f3148e6ca3b771f0adb
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier and contains numerous links to external websites, many hosted on compromised CMS uploads or disposable hosting. These links likely serve as a link farm to direct users to malicious content or phishing sites. No scripts were extracted, but the structure and URL patterns suggest a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cristal-in.fr/userfiles/file/laviximaxijorivebirikep.pdf In PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/ligemoxidiramogan.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/77537811904.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/9336344373.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/qf99ulnp95vcsuj8cvgipred7f/66953650312.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139d90c24741---11225856905.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210921002037.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/votaburapapefuziberutul.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/rogofekawu.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/88690437566.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/76731625889.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/311557c99f9a5f84c06ab57825441e60/62351138827.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/lozozaledapizopumoniduki.pdfIn PDF document text
    • http://davcpundri.com/css/file/1007546866.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/gejovoxibes.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/18403928154.pdfIn PDF document text
    • https://wineart.online/userfiles/file/36601952849.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/23656913334.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/64288410990.pdfIn PDF document text
    • http://julianina.dk/upload/file/8658533622.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/bukofaxumofozewoz.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/wefidevifeb.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/6305693096.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/gorexekabep.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/zadexufoliguxugewuxobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=firestick+mobdro+alternativePDF 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_off0000e6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E8 10808 bytes
SHA-256: 81144b65076805ec414b3dcecf5b857065a999149b52e185e892ca854e4d6716
font_01_sfnt_off0000ffd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD4 17204 bytes
SHA-256: 2930789bff2d272d36a047070e70b1d347886b9721f037e6e72d55b2a19811b1
font_02_sfnt_off00012bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1