Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a12338becf7a1c9…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 23:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0f0ce069147ead64587515613642f07 SHA-1: 413a875552cd0c36378f2eadd2c703262226dcf2 SHA-256: 6a12338becf7a1c95411bef7383880845979398c9e03ccc6a85c0cb40af680ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=professional+adjustment+in+nursing+pdf PDF link annotation
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/56eaf4e45a496d1a3bb1db57d4e71199/xowizasovamedewefalupusem.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081fd427a9c2---99359614473.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b4ba6utebitspb37pppt7s9dj2/tavudevabusene.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/36923572735.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/atdr5t4gfve59bab6qth2l97j7/dezexegunewibo.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ed3cd184e---rumijejudunubanixagiru.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/28037508871.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/82f5ab56f26e492928803378a288427c/44473946204.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/f2b308d5c406d06781c44d8eb8641897/mufiruwuzidawi.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/pururamifefasiximatab.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/kemilexopubak.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/sikulaxufavajimaradupo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6580dc32e---101983235.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/5r3orpc9112e079926dmljgdd1/ratixopufidefezabis.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/60911426976.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/84642728252.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/2570895996.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jofaforoworumoxi.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/mobafekutomila.pdfIn PDF document text
    • http://skupka54.ru/upload/m/bebevegetuxale.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/69052467841.pdfIn PDF document text
    • http://vejwun.cz/images/povawegozizubolut.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/mukuritar.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_off0000dd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 18448 bytes
SHA-256: 4e81bda4f2cd2c675f1518ff88694f972cc3b784110e61d94249144938f5d049
font_02_sfnt_off0001247d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247D 11072 bytes
SHA-256: 64d8283d6bef22d910cdc6692d131b55272063eefd8cea23229a935fcd1e53c9

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