Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ed4df68c3e41f3…

MALICIOUS

PDF

71.5 KB Created: 2021-09-22 20:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 257330fba65ce7b8c763ec0eb1259d26 SHA-1: 8b3347b404663a943fccee0cd9fce82570fff4a8 SHA-256: e5ed4df68c3e41f3e2dae393c02164f61f77f7be2fa522be5b0831154f74f1af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

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://crewmak.ru/uplcv?utm_term=clean+memory+apk PDF link annotation
    • https://dovolena-jiznicechy.cz/uploads/18852752449.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/46851988040.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/gosigelexub.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/defenipujusadavebokumolin.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613db4c9705d6---zodiridokasonulizukakadu.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/58314375524.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161392b9dc2db5---wagivawozif.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/kodotuwomimevipaxizebomup.pdfIn PDF document text
    • http://fedime.org/imagenes/99570249533.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/fepafoluselajad.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/19210267680.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/58649282593.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaf58e33aa---65484335141.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/63544461180.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/gadurisadibulomer.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/bisukar.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/runisos.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109061412069489.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6c990593---46695204637.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/wababaripenavinutodu.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/14036462542.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/tatizukezubedaritifutul.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/wenisubibugidik.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/fikaw.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/rowizapedimulovi.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_off0000b632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB632 16856 bytes
SHA-256: 334feb3537e48fcdbd048062d05072a50e0666383c15da12648fc881be87a1c1
font_01_sfnt_off0000e193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE193 10292 bytes
SHA-256: 4270230a0282df898e8c51d25d6325b233d65b1b2e75858355d72e25de2031b1
font_02_sfnt_off0000f8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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