Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d28faf66d3ff56c…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 19:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 39dcce555a142b9f4c35020989e99c36 SHA-1: 7350649c7f177207195a91f6211b386e4de6abf5 SHA-256: 8d28faf66d3ff56c71e55d44faa1608a25f53b4787915fdf9539fb62ce6aadca
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 compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://allytemp.ru/uplcv?utm_term=bigg+boss+13+full+episode+105 PDF link annotation
    • http://studioingtassinari.eu/userfiles/files/boniviwusivoton.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/kujojererumogusidoluva.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-01/images/files/kigexiwigeninikidudes.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/5b2d97a100c2414412931b95dede538c/pejidukubinerolo.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3pom1nfqm3lfc8r6osvucvs907/ditame.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/bikuwarekamijapol.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161416a7c10436---lufajatunufenewexobenov.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/zuvivu.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/24410162802.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/pegujumejan.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/rulekaripezokikixajir.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614372733ce26---tuminebumevifakos.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/811586d48d48359f1863ad211b3038c1/xijiwepudosipigog.pdfIn PDF document text
    • http://bociany.sk/media/file/59651076001.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/gekirawotubozig.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/wegom.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/50210843796.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/91291979329.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/zimopesil.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/gotusumin.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/dupasigizox.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/6122278529.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_off0000ce81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE81 10984 bytes
SHA-256: 7d95a0c9bd6bfdcfeff0ee15b5e4f1d0e912b22d52372b68fe18a0d9f4c3763c
font_01_sfnt_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 18204 bytes
SHA-256: a227fdbb2f579348496cdc978a4f196071a2d449f8222f8baa6fafe9e24035c7
font_02_sfnt_off000116d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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