Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2b3eba9cd63ecc…

MALICIOUS

PDF

86.2 KB Created: 2021-07-19 03:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 60d393c1c079cd27e1477d032e7d9ace SHA-1: 59dbbf189543fbe94408399a81dd06372c05433e SHA-256: 4c2b3eba9cd63eccce4e2c815af725e896815be311fae6deca4404df098581dc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious destinations. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs point towards an effort to obscure the final malicious landing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/abbe6fed4b867c384a47057fa1623201/mibotevifo.pdf In PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/98637580973.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/0p635n9j9g2giuc0546c7p0827/melidaxarenu.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/woxesupizezewozumoti.pdfIn PDF document text
    • https://eventaipei.com/upload/files/55597351488.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/8k6h67alqolhogr86f6oooahdi/dawofasanukejonafowiwizu.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/jogech1f4beir1p8mr78q4qu24/bixebudexizebivabe.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ab93ee18---68778409656.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/59770924161.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873868e7369---10213822364.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/zubisimimoxe.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/58209146650.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/3f9fa8b97cbddb72a083f6011c5ad5c9/puvog.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/723f5fbd763a8b319670635b48013a41/92675564856.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c3e08348d34e9cb95aeafb5ee189b32e/43155537864.pdfIn PDF document text
    • https://edarky.net/data/file/befuxadedomigaduner.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/72876550453.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc8cb0643---86125567969.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160740a45028f5---97863935842.pdfIn PDF document text
    • https://areicon.com/images/file/jelevefeninalipewo.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f37426d5ca---xufifurugonegip.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/jagepuwe.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/7d2f5bb66c7040834c6e9664e563952a/fovubow.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/r64rnu7aa213j9ukcsnrk9q0pc/rudukasedexolal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=moments+quotes+for+instagramPDF 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_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 10752 bytes
SHA-256: 7bbbb2cc58542c19ddbbede15ebf1fbd73cd748f3ee33a5773783bf40397778a
font_02_sfnt_off00011c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C75 18404 bytes
SHA-256: 81918c5b8d1da2e4ea5461196066829eef2a0fa540e77dddabcafbcec7974487

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