Malicious PDF — malware analysis report

Static analysis result for SHA-256 98482885ebb2c967…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 08:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5800e1d457acaf2fff579b9712db8208 SHA-1: 58b7e32876267e5eb97ba10371f72b23af4ad67e SHA-256: 98482885ebb2c9670c37884e4fe4a0b17920f880ee05daf2853a1634cd6c207c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites, suggesting an attempt to distribute phishing lures or second-stage malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://medvor.ru/uplcv?utm_term=spectre+camera+manual PDF link annotation
    • http://robertoantoniz.com/resources/original/file/50408157381.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/fedibun.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/41bc479de29d4d45a682a1646ca5d195/25309325358.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/lulunevumu.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/kemadowibene.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/63191381103.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4cec30566a2221e511962ecd706192b4/90043184275.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609845195cede---22286413054.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c766099f5e---kamonifejalapanu.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/37205800303.pdfIn PDF document text
    • http://htwy.com/upload/file/63202966320.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/fugiwuxakawutu.pdfIn PDF document text
    • http://ymmicro.com/files/files/13828000654.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/18397771243.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/xisaguw.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/77434424602.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/46785104109.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095e94c79d53---55829491520.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/zufuxasurikedaw.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/85131838965.pdfIn PDF document text
    • https://actor-conseil.com/files/file/wirogifejefepipefi.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_off0000d55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 10328 bytes
SHA-256: e29b6e9794033dc0d56469899c7a3ab55a517911489469484d9ca4778e491f5f
font_02_sfnt_off000104bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BF 18940 bytes
SHA-256: 60c1575256f6898b1b986970c3b999becdb95c3bae07146dd11bd1e76d204874