Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a323b22f732a143…

MALICIOUS

PDF

73.6 KB Created: 2021-09-20 01:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a0118a183ba414edf1f75b009a642e99 SHA-1: 3bce22a0c8ca6015b60d99af273cbc12b234d5a8 SHA-256: 2a323b22f732a14331e992cdda35f465b82eb0a9167675ef0f9547874de27eec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://coretry.ru/uplcv?utm_term=valid+psn+codes PDF link annotation
    • http://urbanelect.com/userfiles/file/panawemonirepa.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/kojag.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/bufomuwepinivejar.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/zumujomaradel.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/nifemibeludomadodov.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/96678053190.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/manadopafopowojikajobis.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/zitivalanunufetezipezetu.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613e88e55fe85---27464876463.pdfIn PDF document text
    • https://otomatcilarmetal.com/otomat/upload/files/94677191934.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/27989992195.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613de3e8bd33b---29655723154.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210908092442.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/feresabuk.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/novepodiripoxukaki.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/91315448473.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/2c2bb3b581a5eabc21e6223980c70918/8760975242.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/menawip.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/55826105282.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/93301583436.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8cf6ebe61---13399223519.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/bafonaruzasominadijogugo.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/14099392722.pdfIn PDF document text
    • https://soechi.id/userfiles/file/lumafazevivikokifiriwije.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4c045477592d4d2d8a9f428e97649592/52373072265.pdfIn PDF document text
    • http://montesantangelo.it/files/files/jaresosezizus.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/33e9c12760417b5ff7ad46fd82b9df0b/garokewidizikunefisaxufa.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_off0000c086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC086 16044 bytes
SHA-256: 0b14da3dc5b81c57129028ca499e46d5029ea39f845216fac77862068aca5225
font_01_sfnt_off0000e990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 10276 bytes
SHA-256: 790583c4db0ace5f540404a1e474f0c2fa104a734d5de7d852d80ffda793553f

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