Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d4368b04335f9c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 09:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: db89a8af1a27aefbb5faadd1391e6913 SHA-1: 0d18505d566ad469c9bf5822aeffa19141a90b9e SHA-256: 79d4368b04335f9cc11d42b3eaa08c5a49b8147840f164febafa967a7c7fdd87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also features numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=smart+screen+share+apk PDF link annotation
    • https://webdatedepot.com/userfiles/file/91491251128.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/dibaxulebagemes.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/nefuwavopuketepikuzu.pdfIn PDF document text
    • http://www.pvvc.cz/files/kolisuvalanizugisejavuv.pdfIn PDF document text
    • http://preprod-proximeo.com/ckfinder/userfiles/files/9630896782.pdfIn PDF document text
    • http://heizler.hu/files/file/11707824421.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210906075338220429kuvgmg.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/rinukepubedadoxu.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/39514804762.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/83139876667.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161463f255f00b---9741281030.pdfIn PDF document text
    • https://basisnomor.com/contents/files/mapovalefufa.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/50533308563.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/35275759786.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/jixomewolizuzef.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/mugosapew.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/gitajefulorebenav.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/d77c6sgb5t0hnrla2t2tfpf1bj/risepasebuvajokisa.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467a01b83e0---bopepawulegoporoxupuvo.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/85146129311.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0f160e3264dfd8bfec460450be055f76/sivegejazodopasoletotimi.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/53518445419.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/susete.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/jaluvegevupomogopewaz.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_off0000d6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 10548 bytes
SHA-256: 8a386a49c0d18c27e04ead14d08291ff56bcf94a6dd5f46123a5ea8b3122c717
font_02_sfnt_off000106a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A5 18204 bytes
SHA-256: 05dbfe93ab7f59f0f07295b24fd39ef31e543bc89844c1ebd0de16a6a71aac42

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