Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a320c58832f7768…

MALICIOUS

PDF

91.8 KB Created: 2021-09-05 21:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a866591933c1bd51587b6bd3c4b6c571 SHA-1: 86a6e63502994ca1ff60586e814345fe9214a985 SHA-256: 6a320c58832f776885fcbb2599b381f556ff1b1e2bb4b68e761822cf9e748851
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised websites, many of which host further PDF files. This suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://sushiloverca.com/uploads/files/netuvamixixafejat.pdf In PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/9a24670cf92f1f9ebc464e67501f3977/7829646124.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/32750792471.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608deff1245cd---8113843494.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082990581255---bibanuluzogonosan.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/49782732567.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c24ae9ad7---86750558771.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/sumukodurofarusijiguli.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/18169152652.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/peed00mg0bbrl6hapvr9c5mnmf/93085904725.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/tenuvusipomefivojeziguliz.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/gexurilalozodoxexivoki.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/42nfjoe5m9su9q4kvmp7l07hk1/foxejusipowijobu.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/difopujiniremoweganudisu.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/pobogasotaxojesa.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/85062918908.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/99918781898.pdfIn PDF document text
    • http://santehnika34.ru/images/file/86544360354.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/c4305c343eb4fcec00c80a4e3b91c3d3/dizoreda.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/e9ofm231tlpfh7mdbi0lioisb2/45698565606.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/ravujevene.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096607073790---19936877747.pdfIn PDF document text
    • https://tavio.ru/files/file/nerafanosasexurosu.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/40266867772.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e030b41ae---turugadoko.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///boginezurup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=gangster+state+pdf+download+freePDF 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_off0000ffc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DB 18604 bytes
SHA-256: 73939523b8aa88e4f19927d59e77103892dbde83664b250ff765d010ee01ecc8
font_02_sfnt_off00014880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14880 10708 bytes
SHA-256: 4ed81974516dc376eb1d4c8dfcebff7080eca6d0ecc0e79112ae3b4384a877c6