Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1584b2ba1bd5a7…

MALICIOUS

PDF

97.0 KB Created: 2021-09-13 09:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f8505b7dcbe29afc9e53e0b69755297e SHA-1: 9ef2a24e14d441ab7d64c5c332a2d5175695c914 SHA-256: db1584b2ba1bd5a7a748e7c9bfcd9130ad64bb4604fe4ac41e688bcd39e9065b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages. The presence of embedded JavaScript suggests it may be used to further obfuscate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ljcod9fqa32f7fpbgbm9sb3mpd/sokafib.pdf In PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/44008774214.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/potodifegekuniriduselomi.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/giwumobexekaki.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/zarotilisuxuxifigalo.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/xatenadeluzojijofozezata.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/wifaz.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613843608514b---31310625851.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/wapazubimojiwatunap.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/bozedujufojofarubenomu.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/xokokulijizaxe.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/tavazuzijovozode.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/85121468750.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/44833018292.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/62898820117.pdfIn PDF document text
    • http://kes.org/upload/editor/files/92392989087.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/14443811175.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/kikerewowukoperuludu.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/28838353034.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/tarodojukizu.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/13297742105.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e162c5f03---lifurixovadurajukupabana.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/bodewazuvilamoxuv.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/48973642528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+increase+camera+megapixels+in+androidPDF 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_off00011343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11343 11036 bytes
SHA-256: 3709a331e2ee3905ec8cc46fa9961c09492f20fdb000265dacb8c689df5c7fd9
font_01_sfnt_off00012cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC3 19184 bytes
SHA-256: 13e0d830df7588e86d4520eb7c01d1dff2ceba2322694f0fac84cbce56a75737
font_02_sfnt_off00015e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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