Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb849e2903ad757…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 00:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 207dc303b0fa202124a7f6b2426f1f68 SHA-1: ea3399c1cd98e08a67916162aacc8a77345011ff SHA-256: 9eb849e2903ad757ce13c50e8be2d596ad4906042be6f611d2a72f96268884c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, pointing towards attempts to distribute malware or phish credentials. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=limpar+memoria+sistema+android PDF link annotation
    • http://tokyosushilohaus.com/uploads/files/segasomuviminif.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/24248864594.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/60968682257.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/10296282277.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/319cccee20cdc94b26b80ad9a6aafa4b/54851266844.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ba2229233308ca086db9ded8cdcff2d2/37987105108.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/22153008574.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109132103366620.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/wefavutewolepuxom.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/radinowepufaruvitexabopir.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/nojenamuxafoxalabaxisav.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/velavewalovol.pdfIn PDF document text
    • http://air-ned.com/uploads/files/81619171181.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/wekefeje.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/gewibemidafu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378c2ece2fc---59494817978.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/jikuloxodefirajew.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161405b07be633---dupasotesimijisoz.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/wemukaxon.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/44106119627.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/51093427680.pdfIn PDF document text
    • http://school15-tyumen.ru/f/gikederelegikutus.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/c59gl3lf2bcfh2b2m1aqcaukd1/malupamixula.pdfIn PDF document text
    • https://clove7.com/userfiles/file/zokebaxaf.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/wejobuwej.pdfIn PDF document text
    • 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_off0000d759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD759 10464 bytes
SHA-256: eaf0797205183127bb43ed86ce5b1bb6a744ca46b889dcd2ac33b66a571e44a8
font_01_sfnt_off0000ef0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 19128 bytes
SHA-256: 85b20538e452f77898575097ee9d82a64af6dc1ba67175ac953e8b8be50e484a
font_02_sfnt_off00011d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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