Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d892d4858c5d37d…

MALICIOUS

PDF

74.3 KB Created: 2021-09-11 00:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1604f770c8f0de11d9a913ecedc269a4 SHA-1: c7609aff5a3fe3359e238e8ecbac3193fb2557a9 SHA-256: 1d892d4858c5d37ddab1bf41a2c8db9d0d525edf94be7513bf23c70e4f75eeaf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. The file's structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://cec-intl.ru/app/webroot/files/file/woxatebiw.pdf In PDF document text
    • https://divetechmarine.com/contents/files/98953698617.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/2387150536.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/46352048412.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/8666102343.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/20241803984.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/95295328855.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2267eb7a---jevigusimagov.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/58119470003.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139537765374---xetigega.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/kagujidubapubunibel.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/wenagufizexazurimar.pdfIn PDF document text
    • http://annabarons.lv/files/files/74957639875.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/77584306100.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/rewoxekurotifuwinixuk.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210902151654.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/80658335638.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc89586cc5---nepopumuwesosib.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/bizivejegitosaxu.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/wudazolodifaxiv.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/bilozatokofuvodutozapoti.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/65173507539.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/31579470844.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/vodapideleg.pdfIn PDF document text
    • https://path.mn/userfiles/files/49382841035.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/rapitekapiwepexas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=my+hero+academia+movie+heroes+rising+english+subPDF 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_off0000bc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC20 11132 bytes
SHA-256: 464b2460d6806d37482774e412d318d6febdfdf420d19ba7652f00bd6a8f6cad
font_01_sfnt_off0000d5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BB 17416 bytes
SHA-256: d40b1bc773f48f9551d413cf00add5b05395027c1cf0833be9319e9253aedfc8
font_02_sfnt_off000102f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1