Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a373d78c961f07b…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 07:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b2486a0b1d2fa526cfba4080a39eb7d SHA-1: f949021c4159bcd039a96f179bdd2afa7d075329 SHA-256: 5a373d78c961f07bf27a47c6efd098d08132bdec60a78376da078b635caa2eb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm, with many URLs hosted on potentially compromised or disposable domains. The presence of external URIs and link farms suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://inwebjor.ru/uplcv?utm_term=dishonest+honesty+manga+pt PDF link annotation
    • http://hanabi-la.com/uploads/files/97366758063.pdfIn PDF document text
    • http://quinta.cl/upload/files/katefolapivejoxoxuv.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/e1u70fe25fumafohfmsm4dghnf/kegujezapimamumu.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/19185476675.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/pidokizugeziwuxom.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/22850326241.pdfIn PDF document text
    • http://aquatherm-graz.at/files/wozazuko.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/pedif.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/tututir.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/72749989831.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f2dfd4f4cd8fb1358f7dac21754bbe2e/vesipumaxuluwip.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/70491146714.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/31375995073.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/lf6diruh7q052q04lvsnh3gbm5/toxukepevel.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/wuwufafuxudivimilisabal.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/fiwasularugol.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/84006704238.pdfIn PDF document text
    • http://bakoca.hu/files/file/rorelofadunam.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144df50e2c53---letivazeku.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/zimupim.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/5097340159.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161382bdbdf0b5---buzubixibitamo.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/46261882867.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/wixupewazon.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/xaxazamubiliwutasogawafu.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/53597296537.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161392b28ed1ca---86243371368.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_off0000b3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CD 15168 bytes
SHA-256: 05459736a3d96e82be5458cba637b8e401ba3e8d2e509f454621b438161f6160
font_01_sfnt_off0000da36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA36 10668 bytes
SHA-256: 934e27889a1fdd4a351e162b15ca22e8014e01fc1652c0d306f1789481094cd3
font_02_sfnt_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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