Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef8ed4cd096577b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 16:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 91445da605430682d47a44ed3da5592d SHA-1: cabad840bea176a8e6b182af8987ff15c98440ad SHA-256: 1ef8ed4cd096577b7158d06e0ed6a092ffcde76faf0cde4ebb999353fd9cba49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains multiple heuristics indicating it's a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The presence of external URIs and link farm characteristics suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://portalbime.com/UploadedFiles/New/file/zuvina.pdf In PDF document text
    • https://rajnnuhiddje.se/userfiles/file/vujuxolukejafos.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/jetubuxakapu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a048e10ae6---mixofatanekokegepijob.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/tarepezazizebef.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/64356125082.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/vubolotegubupabu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc156cf51---23763000373.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/92630361435.pdfIn PDF document text
    • https://tivicom.vn/upload/files/pubuzolo.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/bagepatitexelizes.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/71397879186.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/tutiruzurapujojam.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c953346f2d---kutepogit.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/36999331765.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/peletenipilun.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/mitigejukis.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5215be4f4---10889247550.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/40743189236.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/gixevesovaxovagerop.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/70014967757.pdfIn PDF document text
    • http://superazs.ru/images/news/file/dizavefazukoladiralukog.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/desopuf.pdfIn PDF document text
    • https://limsurempat.com/contents/files/jozenelufanamapagiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+play+store+androidPDF 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_off0000dab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 15988 bytes
SHA-256: 821c70f67c67dd480b67444e730684803914ab0a116e97e94bb21f5e71c3f291
font_01_sfnt_off000103f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F2 10588 bytes
SHA-256: 7992dfb59f7636849627649dcd6df59c0689d1427df7fd836ea42d0709bebe67
font_02_sfnt_off00011c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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