Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f74a703cf9737a8…

MALICIOUS

PDF

70.3 KB Created: 2021-09-15 03:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99ac71053a6748be46f54b6a72148da7 SHA-1: d4df1e4133b948d4be32ca8fc1157dd89f7dbeba SHA-256: 4f74a703cf9737a88c4f74c76e6675fa44cbf5072d02bdd7cfbc315597e5415d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which are hosted on compromised or disposable domains, forming a link farm. This suggests the document's primary purpose is to lure users to external sites, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • 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://pune-india.info/userfiles/file/2728300842.pdf In PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/laganufuvotimizurozuw.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/kukegejabamigivebixojo.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c9fdc2a5d---xidevoluluf.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/43132568369.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412cfc1d862---28677763025.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/wepixorurefurokizikaw.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/vodupuxawaporufiru.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/30055125452.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/wusogejananokukuluda.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/datofusem.pdfIn PDF document text
    • http://contua.org/userfiles/file/10815200759.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/88755392773.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/valukufavisuvewo.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/51907001114.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/445e7d43d74d2917f836e94c161d558c/55342984099.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/26905912597.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/vesideveranenademuwebo.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/xitikejosubadixaxa.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/24520000462.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141196bf368e---50325695201.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a5ece4ed0b640335f1081522c98e1c57/26015732700.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/kizofitinovano.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c8457d47019a141c0d44ec31ecff3ad8/81950423762.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135b4e6a87a0---76442650764.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/tofiguwavakovafoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=11th+science+books+pdf+2020PDF 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_off0000b386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB98 15532 bytes
SHA-256: 9a1b759f4a6aef785534e8d687a1a8f4c6c9b48d8ddd7af6d8aa4072745cc934
font_02_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 10840 bytes
SHA-256: aa2d20da429cff0372152a5c51a91336f007d3f333c206a277fa4134a813f23c