Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a855914485a88b…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 01:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8d2b8004bb65a98ebe7de0f42b1b37e3 SHA-1: e1e303ad68d1284990aa157c379799ca819911ed SHA-256: 48a855914485a88b5f5e2ef9a56699e2d999997fea5fa05c13fcfeb4fc24d90c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection scheme. The presence of these links indicates an attempt to direct users to potentially harmful external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • 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://allytemp.ru/uplcv?utm_term=subway+surfers+characters+cheat PDF link annotation
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/88322253568.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/56704054045.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8a2d655055308ea32bd54fb64988a985/40634090681.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/aj7pdcaj2rhkbs0kr4c0ntfi95/46187258595.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131587685709---xarukatuzatosogofag.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/55987393134.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/87120007467.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/27455518376.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316226d3657---76290808790.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/vedodapimejefufuxotug.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/45633158868.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/sosoxan.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/35368419623.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/69970917867.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161398e9523c21---rinumaravitev.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/voriperukid.pdfIn PDF document text
    • http://synphabase.ch/upload/file/56127405622.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/48758922917.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/salokagumugirixusemofip.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/04da4ef6cfd2f041a8560e1f03db248b/78789957997.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/21191660720.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/lumirufo.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/zatipilimavesibemedif.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/39545803569.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ek5f7vtgm25unk46rbsajmvivu/biwafasuneloxepabagikem.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/vawitesuramitu.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_off0000c2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 16280 bytes
SHA-256: 9f8d610dd990b2f7e18bdeb9a00d932d9a07f089cd6bd32e62c1f7e0581c0208
font_02_sfnt_off0001046d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046D 10584 bytes
SHA-256: 0fe8098cc3a854850f4b5ee517dc266f83fa600ad973473a7b259d26254f7434

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