Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4394341e9e54968…

MALICIOUS

PDF

93.7 KB Created: 2021-09-22 20:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9eb24581ef72dc7407a76004a746442c SHA-1: d5723973af1cccd5f0bdd774a29a20a5d2900aeb SHA-256: b4394341e9e54968149566be70eceaebd596d9f737bdc23f4cb0cbcdaf9e3e59
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links pointing to disposable hosting, indicative of a phishing or malware distribution scheme. Heuristics indicate a link farm on compromised CMS uploads and disposable hosting, with ClamAV identifying it as a phishing trojan. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tuzy.pl/Upload/file/sizexabutitizugewiz.pdf In PDF document text
    • https://takarasushimn.com/userfiles/files/20115390958.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/43352251629.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/75037266561.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/galetibeva.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/8652630654.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/vuforojulawe.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143ec203bb23---97534477809.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/fopupeguvitasogi.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/tatabagepapemiwuwo.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/6630796287.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/96224965174.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/danojafilalafi.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/buvisax.pdfIn PDF document text
    • http://arablift.net/userfiles/file/xujediwipafekabesoxedibi.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/tupetusazuwefegugudaged.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/41635242609.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/46201099943.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wusilesasakatiki.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161473364bb316---wevokikatet.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16145b5acb4367---tipefukanikutilogib.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a41cb7639a---dituxemixufutijubod.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/mobewojozupala.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/18792708805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+perfect+english+grammar+workbook+pdfPDF 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_off000107e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF8 18092 bytes
SHA-256: 397ddb00838b96b6e9698c754cee8c7a8cd979c3b16fac058c2cde6a6d01e95f
font_02_sfnt_off00014eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EAA 11348 bytes
SHA-256: 69cc551366e2acd0e6b6f76cb266e4747d1bab979e2bead508183f5434b42490

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