Malicious PDF — malware analysis report

Static analysis result for SHA-256 270497ad50c2b1d0…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 02:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6de0eff423cd6f302e8352f97d59847a SHA-1: 0bba535f5a5049168bbd57b7270ef32df20a0ed4 SHA-256: 270497ad50c2b1d060c4ba6fa265837152a45ad30ce646b4cf622e6652785eae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) and the nature of the links suggest it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/21196247587.pdf In PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/638f9d2cc8820365c0a37ac20d074fa7/44720652395.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/vozikozagixisokunajij.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161393438a822f---51695625045.pdfIn PDF document text
    • http://hangquangauto.com/files/61437012045.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161392998e4f8b---towulifukatijowivige.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/nopawazevemufugobavuba.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/88739696825.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/zegagafuninunaxipat.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/81636844523.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/94571483077.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/88347202175.pdfIn PDF document text
    • http://precisao.net/files/files/29122612239.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/35225954962.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/zirikekalowosikokekukaxir.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/febiboxexubunul.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/55718268549.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/11182553386.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/latirafetijakedun.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/soxobejemuvififizibet.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/janewavukifu.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/pepimukexotonij.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/66419286181.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/82786313670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=dbt+skills+training+handouts+and+worksheets+second+edition+pdfPDF 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_off0000d958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD958 11320 bytes
SHA-256: 36ce165cf8062d1b818b7a0489afba26ed266820b0552ec29615a1c410a15896
font_01_sfnt_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 18312 bytes
SHA-256: 79c945124ad1a62c7fb476a46458d643c69c166949a4f9a61c50d0be2921890a
font_02_sfnt_off0001227f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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