Malicious PDF — malware analysis report

Static analysis result for SHA-256 a841164267e507e4…

MALICIOUS

PDF

75.3 KB Created: 2021-09-22 12:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e5a72fe7efbc88b2ad3044526cfaab58 SHA-1: f0755c9f162bfbc23c4d8dc38c732f14e6479986 SHA-256: a841164267e507e4cb227815e25aea23a5b6c7bee4a4344424a54e92ece232ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, strongly suggests a malicious intent. The ML classifier and ClamAV detection further corroborate this, indicating the PDF is likely a phishing lure or a downloader for further malicious payloads. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://krisoc.ru/uplcv?utm_term=stream+the+war+room PDF link annotation
    • http://sprinter-lab.ru/content/File/58797699084.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/xunukusof.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/diroveseturoxip.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/20572941293.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132727cd0d99---55271644322.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/rataf.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/69895319455.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/47343453046.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/228b81fee90d74b5a5d29003b34d47a5/3771843217.pdfIn PDF document text
    • http://friulanapanini.com/images/file/61705427507.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/rigekawodirazogiseno.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/42215261854.pdfIn PDF document text
    • http://aven.su/userfiles/file/47423828195.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/8abb3b3f4606c7f24e3678d886612576/98564894879.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/20775459456.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/2rosqmmff7u7pajtteoaguvi7n/gesefesedusuwi.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/52640677596.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/dekokelaterat.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/74690942769.pdfIn PDF document text
    • http://mweb.cz/images/file/kufabatatatarubet.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/rixuwedejuz.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/95072258776.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/rajowupovefafikujox.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/damopekuxudarixegel.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/60821751742.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/53747728282.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_off0000c2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AC 10124 bytes
SHA-256: db287420e8cd5f9a761ab38a54346c7dfe0abe5f6fe94e79335fe74b0f90ee79
font_01_sfnt_off0000d967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 17680 bytes
SHA-256: 18f1da181dc0617aa31a46906be7c27414b83726cbc92bf9685c5f203db35c49

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