Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec641bfe578b5b1f…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 05:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bbc02d391f66e243d3040497e07fe14b SHA-1: 9774192fa9814f0d51ad9937193b4157f66a369c SHA-256: ec641bfe578b5b1f51ec7c779eb53b64f379beb25799b6308a8b9ef227e66fc0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains numerous external URIs and is structured as a link farm, with many links pointing to compromised CMS upload storage and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL targets strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=intermediate+microeconomics+theory+1+pdf PDF link annotation
    • http://vankouwenenmastop.nl/UserFiles/file/lafiravapabope.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/192c624d2ed87e128ca08c059969a524/lopiralurebenemifataga.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d360714086---41748032879.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/muwiruzab.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/gavezirudadudasex.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b13ed8009cf---podaxaxiwav.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a0dbcd7aa---posax.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/91d00a084d44bf8bb3e4342e6a0ee457/lajobarogatekazane.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/uic16vpkcv8cpd3im0ou3rbge7/56252983439.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/sakijovowutajaveluzerom.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-23/20210623015807487231.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/5275ed4bc33cbef1b2e5db448c2539be/67965308742.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609649e47c88f---povalafutusuregudobat.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/lanurusivavenapi.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/xaxaxa.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/wuvimizile.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/dumatisuse.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/bowevevipajokamimomikog.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/fewopisemisusemiwiwupiwu.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/venijupapajomipun.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/70725948577.pdfIn PDF document text
    • https://lecachet.fr/docs/files/94746685043.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/newiburonami.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_off0000e15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15F 17332 bytes
SHA-256: 9d170897930947107c711dcd444739ebda499806fd15167bbb85fcce3eeb90ea
font_01_sfnt_off00010e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12667 10956 bytes
SHA-256: d2a1e47ddcd47ef357641fc27a5de5bf119968c666e173c307aa4491159fef24

Open this report in the interactive analyzer, or submit your own file for analysis.