Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a77948e1ed525cb…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 05:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2900e62f71410836180a4e73bf778bb6 SHA-1: 567fd01d304a9296ac8ce5f56f58bf5cd8543df6 SHA-256: 1a77948e1ed525cba9a8d5bbf3bd4325816c2ebd2e80e9325f0de9c56f0d4b60
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to external resources, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content or further stages of an attack.

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 https://kaimano.it/file/14621045209.pdf In PDF document text
    • https://durimawar.com/contents/files/sufawim.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16142735f64258---vimuzusodogesafe.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/37718207513.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466bba86006---70512538516.pdfIn PDF document text
    • http://novafish.it/userfiles/files/pojamegekofonofuranot.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/rofoxeruvivukafofoj.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/boduxadaxegokut.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/03era1c12c61fqt47vfr2pbpvn/57564355333.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/jomigi.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/puvazalokisetumisopa.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/baduvokepujinimasoxoven.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/malajosipirikavuxijaf.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/gulexesir.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/butunabeziv.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/sulakit.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/11242637975.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202199755555503.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e18c84f5b---77163049290.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/22582620593.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/21578724892.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390129d7815---pipodepizam.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/66664871505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=iptv+cat+freePDF 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_off0000ef99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AB 16412 bytes
SHA-256: 96d7e4dc66a93c23498b57f5a972f01b0a9f2b42340d1a26fe9da805cdd4bc10
font_02_sfnt_off0001321f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321F 9960 bytes
SHA-256: b9b5450f191fae5bc27803bbd4628ab59061aa3d0f666c054cf337d35d706218

Open this report in the interactive analyzer, or submit your own file for analysis.