Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e38c33c6cd8146…

MALICIOUS

PDF

68.6 KB Created: 2021-09-17 14:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86ea0789cbe10f2a162df5ba94d17675 SHA-1: 79fb191aa1726a682664e421e12a7ccfcaa08914 SHA-256: a9e38c33c6cd814604d7bbc972e35b998920eb43db5dcea4ec4ecb93618bc7f5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with an action trigger, typical for directing users to external links. Multiple URLs were extracted, many hosted on compromised CMS platforms, suggesting a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://bibrka-school.org.ua/ckfinder/userfiles/files/74322126254.pdf In PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161347033cffad---rasakajabebed.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/51576757583.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/lavonidejajapa.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/natiwedalumikatuzepixuv.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/safitolusagav.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/43015821917.pdfIn PDF document text
    • https://coil.hk/upload/files/19441116098.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/lisikasuzemanelififitol.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/kavidiwogonibatozoxipus.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/roriza.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/xizejatupemobib.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c432f5547d---winukiludesoxegulibiwokib.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/af2da1c3b389b36e9c3ebf337b1afcde/10803956262.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/rukekifurewivuwumudan.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/6219058151.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161342d6ac8166---luvatuvano.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/66382639340.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614137906d54d---89362630606.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/50215160795.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/lusebaganedaboneke.pdfIn PDF document text
    • https://armenia4d.com/contents/files/72055750752.pdfIn PDF document text
    • https://palet-school.com/files/files/kirijazubopibafador.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/95178618157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=a+href+email+toPDF 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_off0000b3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C3 13876 bytes
SHA-256: 2314c5195d6239cff5eea2a7ec278466b6676cbe40353c7bc624aa996d946065
font_01_sfnt_off0000d5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 10188 bytes
SHA-256: f79cb92c6ec1ca087b2868a0d2c2e4c97bc2b356da7c2210daffab055a6929b3

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