Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec1c0b8e2579f04…

MALICIOUS

PDF

88.6 KB Created: 2021-09-11 10:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3827208e09839f48efa1f3870c6d107c SHA-1: 38fa37636689dabf3616e38dec71f7aeda95d1b0 SHA-256: 5ec1c0b8e2579f04bb7ba0c53f25e18f3523989836a5c75027590ac5124cd3c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://ostrichtours.com/ckfinder/userfiles/files/35054347251.pdf In PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/sowoziwi.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/29443370321.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/datagesadiriroxifolizok.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/gafijeloboluzovad.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/47026253270.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/gosefofejogupupiwazugur.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/11488581343.pdfIn PDF document text
    • https://cubic.is/userfiles/file/67644211327.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ff2e2f509---sopozelige.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/58552019562.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/vowozutimoganupulemuf.pdfIn PDF document text
    • https://svltv.in/userfiles/files/94428664457.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/53369211868.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/56548140647.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613714cbb426e---92446218909.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/65247448258.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/wuvijidi.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/kovesafawepili.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132d116eb8dd---dimotudijonisavusiwimizo.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/lurebusalunadibeze.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/fepawux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mi+browser+download+apkPDF 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_off0000f547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF547 10600 bytes
SHA-256: b086ea54718af8085f7a5374c5d7c115b864809134f5f449a4aad75622c2cb2e
font_01_sfnt_off00010d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 18356 bytes
SHA-256: d16c9cbc0fba3a3a92bfee9987e8766c9d7faf19f1ac25d226f8048393571973
font_02_sfnt_off00013d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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