Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3ef736afda8a5e…

MALICIOUS

PDF

89.9 KB Created: 2021-09-09 23:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a3c3c85af7ffb296d380296c866fc6b SHA-1: 320b67b28af6b1c220eff0043f27df8ccd2bf212 SHA-256: ea3ef736afda8a5e14b9ea12e69f0b3a1b91e88930c1611686529fc0b4c31dd7
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. No scripts were extracted, and the document body was unreadable, but the overall structure strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://ketchas.ru/uplcv?utm_term=apk+aa+mirror PDF link annotation
    • http://car-zone.sk/data/data/file/64172808233.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/lafozusegaxoxaparom.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/32037160118.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/godunobazonejubatoxotenel.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///pirasim.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/bevidizuwijilu.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/pipuje.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/tavagaxuvusejugomaxewagek.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/88041104223.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/77397768785.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/91678429022.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/56254914471.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/c01c22273ee9d0972f75a41141b0e9d6/rezaj.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/jobedamafamutisadun.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613790d44d633---seguzozogirivazabasi.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/53495595394.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/76999164551.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a17d941a0f---pavozavuzaxebi.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/30657546167.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/31896392327.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/dutamamezosiwapujiwaku.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/rovovanozopimotudako.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/6ao3e2eumrr2eah1a6agbepkj6/bejikuxaxabefejajigobite.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161352ea126658---wibozuw.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 16368 bytes
SHA-256: de269a1e433d11572acf00dcfdef4d767f1810002bd622b7e02faab200717eea
font_01_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 9940 bytes
SHA-256: cd1ee3ef1261ee61c2f62aeb177af196105d3a9ab8549d9ee192a910bf06c0bd
font_02_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 21744 bytes
SHA-256: 15b566545a17d942de688bf285eb8920342024fa1eac35075aea123cbe951aa3
font_03_sfnt_off0001416a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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