Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58fc91ba604a8f9…

MALICIOUS

PDF

73.9 KB Created: 2021-09-11 17:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff8ab12c5c908909262c559e8a2d467a SHA-1: 6a6bb5e608d74ea28f0881648e5b59a6a68df5c2 SHA-256: d58fc91ba604a8f9583f296ad9899aaceca6a0ef58996c2ce9c09c4518f0bcfc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. This JavaScript likely redirects the user to a link farm hosted on multiple compromised websites, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The ClamAV detection and ML classifier further support its malicious nature, pointing towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://desushibar.com/userfiles/file/fopixopipewotefi.pdf In PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca8a1b0159---kaduwofijagagoz.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24455824988.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/lowunutupibapefi.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/xomupubiritamosexudetag.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/65861837287.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/58157836404.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131acc96b03a---47807784900.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/81587168895.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b1a07e87---xebozeli.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/40415888821.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210906_071411.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/48165887630.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/90139472022.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210911075700_jmg984.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/24748532058.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e3e0597a3---fakerurotepud.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/27101035308.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/xapapogoxurolaguwudepil.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/tovipelixasebapexino.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/batesuwezasinupapoxirowol.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-4/20210904021018206408.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/78520507834.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/juladujuvani.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/96782023585.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/wedugopafewezuxapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=hero+420+bengali+movie+watch+onlinePDF 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_off0000bc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 16992 bytes
SHA-256: 565f82f61fa0d8f44f3e2fa5e2552667fb18bb0b7187c6903fcd67911079739a
font_02_sfnt_off0001000e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000E 11112 bytes
SHA-256: e266c3a11ac83a40e4c67c7402177a71e74d218185ff697cd6e6cc6c83724794

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