Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a1b947003b2838…

MALICIOUS

PDF

76.9 KB Created: 2021-09-06 10:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a953f6af882750f123042789bf5b8f1b SHA-1: d9620042528b75364cf85d9d8dc2178be0a73916 SHA-256: 48a1b947003b28387f2dddde40cefa55a05a02eb6a1ac5f82092a1ddb9098c50
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the link farm structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ae334f46dcc32709c04ea35297dc00cf/53693480882.pdf In PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/gatijemose.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/83821556348.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/55566076629.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/39187112368.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/xofomovepa.pdfIn PDF document text
    • https://vzglavniki.net/data/file/memakejob.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/vugubik.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/kukaderuretanexizododila.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/timefozubinivusegunumowep.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d802fa2d76---97868301041.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/sivakowi.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54533292749.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/5sb3jnjpft2tccs3u67p15mo5f/korisobopanufinezivovide.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607255304ebc8---76537004967.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/76987721659.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/10799237561.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/jazimewowom.pdfIn PDF document text
    • http://allasclub.com/campannas/file/56331851469.pdfIn PDF document text
    • http://biosite.ru/images/news/file/pevekipe.pdfIn PDF document text
    • http://jiab.net/userData/board/file/61963675346.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/lotabufilipuwupisik.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/c1a5f4d5c6c15fa4f51c60289f9d734d/23356969791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=xodo+pdf+reader+for+windows+7+downloadPDF 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_off0000c774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8B 10536 bytes
SHA-256: 5376fea9bc6dcdb0a65206fcda17c1a4558115099e20f99ce7949f11b0e805c0
font_02_sfnt_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 17712 bytes
SHA-256: 77aafc8df7b26a35fb49f8954d9296d3b67004fc490359398edea85211f39b5c

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