Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b5ff46c1e8354b…

MALICIOUS

PDF

85.5 KB Created: 2021-09-11 16:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c73dcd412973acb6fc3ee7c65079651 SHA-1: 85de0a47adceb8ca70152a90371b026aa59f31a2 SHA-256: 78b5ff46c1e8354b8f77da9f2e79d48fbd526c7defe944bb710c049032f43a19
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 CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=mod+apk+lightroom+full+preset PDF link annotation
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/81a79efc06ecb0316f570bca734d0e1c/35506444495.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/bubapemizunidosoxezorov.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630633419_1.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/sujige.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/26906015383.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/joretoxivox.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210911_3D5BECC297B27759.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/66878887594.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/piruborilanapevogidi.pdfIn PDF document text
    • https://reha.bg/content/upload/file/24535453725.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/86886667973.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/72066598784.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/75819156860.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/rutokudefigine.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b3ec9665d---lawegudijizal.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1631321903miletizoluzup.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/65410771907.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/biberaluw.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/gemitez.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab2925a43---depenivizasafuramaw.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/pekub.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/vafaj.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/41593428631.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/pilurupinesijugaxusizewi.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_off0000eaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 11024 bytes
SHA-256: cbfba4948d348ec4b7d2bfcb3ec67dcd8a54ebd12b0526f3c6ea3fc59f894468
font_01_sfnt_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 17272 bytes
SHA-256: ee9ceec542ec0e6fe6fdafadf33c18f85716ec26c2ac7d47fcaabacd22789b7f
font_02_sfnt_off00013044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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