Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b10da2411d221d…

MALICIOUS

PDF

75.7 KB Created: 2021-09-01 06:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d9947b4cdf16ff7248dcf6269900b5a SHA-1: 54d8d3503b810fabffb27d4cf528ef27ab0f54ff SHA-256: d7b10da2411d221d2c0c5123dca7c2dcc6fd65bf70034bd5a75be5e6f59ec783
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to external websites hosting other PDF files. Several heuristics indicate this is a link farm, with some links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • 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.
  • 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://pacie.vn/web/uploads/files/bejemawubilebimolazukikag.pdf In PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160805a3459b71---wagoroguzejapi.pdfIn PDF document text
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/lapurasusefetufevelurav.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2591d59a97bf966fdd52863f7d68e25e/91523125606.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a641b08798---vodolilejavaxege.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/15673996978.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/mokefodulexurikilizido.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/jaruluwekuwofuw.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/88781020513.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/55773230125.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/61223549619.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/bitumegamot.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/fotorixoxipefa.pdfIn PDF document text
    • http://web68s.com/upload/files/kotirij.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/5116d11f4bf5156aa84d7c74beafc586/3501381455.pdfIn PDF document text
    • https://lecachet.fr/docs/files/julakewelalewidipi.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/13450794457.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcdab2d467---77842263785.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/teduporilija.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/musamafekitu.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/8782580587.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d9815b13f71a5fae1573db437486ee6e/goxibuposisiw.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160719e5ba25e2---80047270884.pdfIn PDF document text
    • http://df-2.de/images/daten/file/41055523725.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079125ddf963---sigifadeduguti.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074378363676---31054491103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=harry+potter+the+goblet+of+fire+sub+indoPDF 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_off0000c3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DC 16516 bytes
SHA-256: 9f1348bb62ba30a98672c1292d8c6946a9bdbbfe23ccc8663924d5cc16c1d907
font_01_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 11124 bytes
SHA-256: 2af7fccbdc3189278674efc526f4ab0e7fdceb12ac989e3db0386c8a1d8849e3
font_02_sfnt_off00010812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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