Malicious PDF — malware analysis report

Static analysis result for SHA-256 f586d9f08331cb17…

MALICIOUS

PDF

84.3 KB Created: 2021-07-14 00:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10bb5cc3f785fd8694a4407719d1f26b SHA-1: d41c2af31c3a99a4c62e8b5be1828da68adbaa2f SHA-256: f586d9f08331cb1776d235a460d30a8f975d43b566df24a399878f1c4b89330d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://andana.us/files/files/duwexupenagubafo.pdf
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/ronizi.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7471cbc5f9f340c3da26d0f20cd62929/24317374086.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160823c0fc6f0f---budosesitixibijovidigu.pdf
    • http://mikailang.net/userfiles/file/20210514161715_1357605771.pdf
    • http://thedreams.cz/files/vigisokomo.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/rilizexuxiledu.pdf
    • https://annekienlen.fr/imagesfile/waralololelusaposon.pdf
    • http://amdind.com/userfiles/file/jimamafukedakixara.pdf
    • http://liveranigioielli.it/userfiles/files/miboxefojakopozexokok.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c5504b46dd7cede97e57ddeb71c530bc/46180070842.pdf
    • http://diplomat2014.ru/ckfinder/userfiles/files/34475292557.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/1b5fa19a0300255385e0dbf9ef9c5d29/65233799435.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffaceb40d1---9961981002.pdf
    • http://hondaotohaiphong.vn/upload/files/33512318626.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/de975886d3b64c1d67bc18a75fd4f333/44955782913.pdf
    • http://elfuklid.cz/foto/Image/file/54875191242.pdf
    • http://reicar.dk/userfiles/file/13809272161.pdf
    • http://ilovegabal.net/fckeditor/_upload/file/nazet.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160708127b76f9---rijemuwaju.pdf
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/96022154711.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/cf687c4c611bf007750112d1e7a39221/1605670233.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074441263dfd---88309256079.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/7d15d414658e610ce541029aef7f83ef/99604648602.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/89ff24777a3d06e3256567fddc9415d7/88988369480.pdf
    • http://tapestry.cz/images/file/files/pegepesedoxomirafima.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=multiple+choice+questions+computer
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e507.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE507 16792 bytes
font_01_sfnt_off0000fd1e.bin
16b398de901dfb8fd1a84079a2866918bda800bdd8adec892034da8e9b546d72
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 10716 bytes
font_02_sfnt_off0001157c.bin
07ecc5c826e7eb6bd705a46cde0aada2da1cc2903155b5355e9a5110edddd611
pdf-font-stream PDF embedded font (sfnt) at offset 0x1157C 17480 bytes