Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b2f7d4156ffcb5…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 01:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0170e6312feb0274ce1ceee283bcf0e1 SHA-1: 8163f24166144eb135f163115774d1d955221da5 SHA-256: 19b2f7d4156ffcb50b28579594ba4b1de432a1fec6fa4a139921a350fb57e575
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous URLs were extracted, pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is unreadable, but the presence of many external links strongly implies a malicious intent to redirect the user.

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://cardolf.ro/files/21243986097.pdf In PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/71743018870.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/sapepot.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/bagatan.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/gaxuboxu.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/598aa59383fb77ab8f466783fb3469b1/mizudajomo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614093303856e---xugaxawo.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/jitazan.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/47620047133.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161313c3fea574---1479323829.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161426e3b48169---77901363193.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/giveriri.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/37463038288.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_12_04_13_07_1360.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/91566592575.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137e30943f3a---kidululewutagoguwigep.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fed63f066e---90782369765.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/sakalobusuvetofunifev.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/karikidex.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/cfe3b119758f179c6d6c6a413af6f7ba/kexegixebile.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/39653627518.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/88319142371.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/xemufatapixogusubepaxeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cp+warzone+freePDF 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_off0000d764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 20068 bytes
SHA-256: 74d95c56ca0dc6ae300044c4964327049ffc8d17d94a6141de89dfe3a37e6209
font_02_sfnt_off00012327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12327 10124 bytes
SHA-256: bb60c65756c6733cbf55db002b0a73a2740a93c59bd5c8dad2c020902695b7a0

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