Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecc20d9c730b9a3…

MALICIOUS

PDF

85.3 KB Created: 2021-09-11 19:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 26d1c040dcf98952f6bd02bc04a86a0f SHA-1: 44703de6b89f6d42106dee4dfa0d39fda8f9b552 SHA-256: cecc20d9c730b9a38d2a390011fd399f0918752ab966ea44e2964e1eed7e3951
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as a Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://agriturismocorteerbatici.it/userfiles/files/lidazabifoguvugugofusa.pdf In PDF document text
    • https://e-fasteners.eu/media/file/94240980040.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/56149814909.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/9896064531.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/71310596625.pdfIn PDF document text
    • https://premiersuli.hu/files/files/mexazezukufed.pdfIn PDF document text
    • http://candientushinko.com/images/file/64201599432.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613290336a57d---venobiwab.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/91955802523.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae56875ce3---91410806878.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/porazatumi.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/xasibo.pdfIn PDF document text
    • http://beta-rc.com/upload/files/gekejurexumo.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6c990593---46695204637.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/karuwogurivaseramomamo.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/9600564833.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/zixagaxusabubulepe.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/11259259057.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210911201632.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/63050101555.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/vuvaziwodurujutedadizap.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/66241532766.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/ririgenuzedodajuvux.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161320681bd213---63859919138.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/77126785605.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/nagejikopedetutam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=3ds+gba+emulatorPDF 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_off0000e42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42A 10708 bytes
SHA-256: 6356aaa2c31a332348cb0736ea7590d6c779c306ea4f6706af79d96d63dc9c64
font_01_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A7 19316 bytes
SHA-256: e5b1bd98eeab4c2313336d6cb9d70f5ce81380b149952b7e72d55368238cf83f

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