Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2616265bfb37436…

MALICIOUS

PDF

87.6 KB Created: 2021-09-11 14:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d33fb10be83bb2f1d45aff6ffdb6abed SHA-1: 3d88ca67667512fff0202a7d8c2c83522aefe7f1 SHA-256: b2616265bfb37436825ca53ba3b77c460c6ec0effc465afaa054bf0b30cee5d5
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs the user to copy and paste content into a shell, a common tactic for executing malicious commands. The presence of numerous links to PDF files hosted on various domains, some pointing to compromised CMS upload storage, indicates a potential distribution or redirection mechanism. The document likely serves as a lure to trick users into executing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://thietbivesinhanhhuy.com/asset/files/90336179187.pdf In PDF document text
    • http://xinxinhouseware.com/uploadfile/files/8765500963.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/24380102747.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/42660104957.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/gosubifutagov.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/vusiwujuwopiwugufilakanib.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/36877919547.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/pqsrnkhk59j6lqghnalbtchmh5/wabojexubabokotiresojosap.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e816f208a---mamara.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320d39d74c2---punikebozeso.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/nujoragi.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/dixodoviwoxebedeled.pdfIn PDF document text
    • http://119pump.net/d/files/60828255356.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/44939557466.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/89101998744.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613be0e520602---wapuxekupobazux.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/valifajanunegu.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/xaxarimewovapan.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/95102515926.pdfIn PDF document text
    • http://zimmerei-possert.at/votubo.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/7hja5c36lfpfnannaqtoetm190/logevarisifose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=install+fastboot+windowsPDF 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_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D3 10292 bytes
SHA-256: 64ea37fab324586484e3c48d8f28c55803eff273b5829b647ada7f655bbcc5e9
font_02_sfnt_off00012121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12121 18500 bytes
SHA-256: 5b145f8106959d3cc6e00b2056fdd1f67210d1897509970d0bbc6cc8e2c6fee1

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