Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5327b604829f6ba…

MALICIOUS

PDF

94.9 KB Created: 2021-08-02 08:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b6e44ec71f037fe61d74f4a04b9743c4 SHA-1: 49d07ef21e9324ec1a9a05438e857e993a4e7209 SHA-256: c5327b604829f6baa50ade6079c49cac74d347c187c9f5f6bbdc501aa53345f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicative of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://philabc.ru/uplcv?utm_term=what+is+the+moral+of+the+story+into+the+woods PDF link annotation
    • http://bannermaul.com/userData/board/file/zovigu.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/gusipofezavaxoxumofowok.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607364422b8ac---35116040344.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://www.sport-konyv.hu/userfiles/file/51845354261.pdfIn PDF document text
    • https://auto826.com/uploads/files/rusipowi.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/079ea2686d94bc9f84050734833018f6/61736449028.pdfIn PDF document text
    • https://onwater.my/uploads/file/nosopunetifasuwamibibur.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/bufufivujulajibilutabe.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/vv4kqquodo9n67avi6fl5d2fl7/56688150164.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/12626758011.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/fudifelozemirelawareje.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/matatopogireti.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/xabalukotabewafen.pdfIn PDF document text
    • http://myredm.ru/uploads/file/fobisetuwobowedoduta.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079edc7d1e0d---vekedadebutit.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/11508190273.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/74724609778.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/gukixoje.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc72f3de09d---zadolituwezadu.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/tufotesujezewekavepod.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/0d040d96609bbcdfe5a066b856a10e84/46854039707.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73D 10812 bytes
SHA-256: 6890b37b3776a4fb85bbe35d4f5ecad6c010bf7693db36d125c72688355eddc3
font_01_sfnt_off0001100b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100B 16072 bytes
SHA-256: 63466e8c4486cc9e9ccd1d3435c610667c9c3b15a158337361c5f9ee72d2c25e
font_02_sfnt_off00013985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15196 17828 bytes
SHA-256: 7254e31a3f13b809cb3861d008f90f30e053303dd5bf4ad7391e303770b3f049

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