Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8cb72bd9b23058…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 18:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 621637389a979b049649ab59f5792811 SHA-1: ddaa7dbc123129bfe25677565977f73e6dc2dd59 SHA-256: bc8cb72bd9b2305819dbe192e2afe916ca909e74d7301b25a06bc153523c4830
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to potentially compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. The presence of multiple PDF files hosted on various domains suggests an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://noithattamphuong.com/upload/files/mapisawitiwabijikifuxag.pdf In PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/nobuzewabuw.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/27362968668.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/56826242475.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/31672209244.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/55446692676.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/11452438206.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/femaduduwuvob.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/sexoduwuwaxibesure.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/muviledesarovodododomelep.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zovefakobufabid.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613568f65804f---52524553341.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132e743e7380---jokovokosomanegasidero.pdfIn PDF document text
    • https://kaisar168.com/contents/files/31491024031.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401fcbc70bb---tinoxedowepixilovunake.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f317e8cf7f---22459664275.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/gevotazofamudovavagutar.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/zogupoxezoku.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/tupusetesebuva.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3ce93d2c---jurefaziwuwatipesisowi.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/18819301215.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/bifawawesuvokep.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/48380319145.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/7795735954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=full+android+watch+faces+downloadPDF 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_off0000e54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 17532 bytes
SHA-256: 292568f55d1ba1ccd52ae52632f6afcf6b744afd2f028c80b4f39a9f00a38c65
font_01_sfnt_off000112a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A9 10736 bytes
SHA-256: 906b14ae07ba954078c477f464da215be4032d511ed832a3a2ce50ebf7d0636a
font_02_sfnt_off00012b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.