Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8f5fa5ba9ec05c…

MALICIOUS

PDF

82.7 KB Created: 2021-08-25 04:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7eaab47961580e720a62bdfe18ffc3a0 SHA-1: 3b0f59ddc49a04feff8cfde258a2a99c74e44f4e SHA-256: bf8f5fa5ba9ec05c792b7ef9b37ac346ff747802d887d7c400408e9a4dfe60ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised or disposable domains. This suggests the document is designed to lure users into clicking these links, potentially leading to phishing pages or the download of further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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 https://laborke.ru/uplcv?utm_term=college+of+the+nazarene PDF link annotation
    • http://seoulsquare.com/userfiles/file/wijiregemubisusetawi.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f8095900d---37407906028.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/3067735405.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/pisuluxudovekajupelata.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f760028aaf4097ebdff4b7f5c9dd5d7f/jifugobiwekujawavinobo.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a02f579b75396d76605230edd3e63392/jatejow.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/66921854473.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/6b016e5bcf1eb96716dc1db51b07484f/rakododubaguvojajebodu.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afae4b4f5f8---tigimisaroxigij.pdfIn PDF document text
    • https://riwg.in/userfiles/file/zeluxavaz.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/km5bu9sm2563h8o957h08ao1p2/guzirikugotevuv.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161079bfd5d2ef---pebiguromoge.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/7c0c2f5d104107b10aa92f91043a26a7/92453845213.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/kegoziniduduvepexolo.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/sakawakex.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/26540320584.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/lufuvobiro.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/94973920953.pdfIn PDF document text
    • http://cortabellanews.com/userimages/tevitipimomobep.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/03bc9600d36651d8e78e44bd04e2eb55/duwovisomubobifuwusoba.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba285d50de---finexoduvuwafuzemadusi.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/makiselexid.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/tujevotupogoworivajo.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_off0000ded5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED5 18516 bytes
SHA-256: 98d21afaf9e291a6d0f19348483a33b46da0ddc341bcf2ce0ccdc42f9c5a95fa
font_01_sfnt_off00010e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12622 10324 bytes
SHA-256: c5e0a62fa9a705825219ac78cefccbad98f8941fc65d806c74e3dcc7509b83a7

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