Malicious PDF — malware analysis report

Static analysis result for SHA-256 6abff41c2af724b6…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 14:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 2f2f8825101d9339c328fc75bb75693f SHA-1: 94bfc266afc1fd39681cd28aa8c3f617f8b38e7b SHA-256: 6abff41c2af724b6d427fc01d221fbffa70568292d2697d122c40159587b3384
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

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 http://3colorjazz.com/fckeditor/userfiles/image/sirinurakefevokukosof.pdf In PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/pafunarejinala.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/xusujerovimuzelejijuguk.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/40251378252.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/1059369005.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/3175784810.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/nunezixesodob.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/fositutumasuguwe.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161385ef51d02e---rotinuwuti.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/40161373539.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/muximanejalif.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613711aa605e4---1793041244.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16130c4edc386f---naxapobozib.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/51137489413.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/88261997966.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/52152668049.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/94191436683.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/27652620128.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/fatimokugomugakegivi.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/71181313506.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/lupudo.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/togugewubojudunuzisab.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/37483362262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=basketball+all+stars+unblockedPDF 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_off0000de35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE35 18772 bytes
SHA-256: ce4fb5b4a0c0661e35841527be53a68ce5460026a3ecefaa854ad1b07f85afed
font_01_sfnt_off00010f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3B 10656 bytes
SHA-256: 8b44dc8f398b368eef07e1241bdcb2a43101d31547c8a57f15932dde67247246
font_02_sfnt_off000127de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1