Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1723be44cb72aa9…

MALICIOUS

PDF

86.5 KB Created: 2021-06-29 22:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03bfc9c1218e2e6dd4128f9371b8663d SHA-1: cb5d60eb3886bbe5b23c8c75012eabe7f0cc1cc9 SHA-256: e1723be44cb72aa9113f8d4cdc44b9f7782c2fbaac5c39801f071cf8354a653e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://coretry.ru/uplcv?utm_term=god+with+his+angels
    • http://lnaixi.com/userfiles/file/20210628015505_2110616275.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071aa370e220---10768475311.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f477f70e89---manopegojonexutajelulabiv.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/f8634f972151ba402b0752886f28881a/34957634166.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/8f11deb08a3a4791870b0fee33338bc6/47226971150.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a6ca717ed---10728358200.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b04e6f1926---21616693756.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/13l2i3jc3hsp9usqlca82up8si/reriba.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/eo8m6ql3u0ba4hamgfvrkjjudj/29260002398.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0706f067a---29708008905.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/1fc5b167872e27e57f4c5c5c5aefef2e/wumejirojijiwamiwazolufor.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b56f65a994---45375632109.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4219207ef9---47229255707.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c459eb95e72---zuninuvokakamajupuvup.pdf
    • https://mimpisiluman.com/contents//files/fujubow.pdf
    • https://tenfci.org/userfiles/file/41199424344.pdf
    • http://www.zywawiara.pl/pliki/guvovorixedowaf.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e765b9078f---19479878519.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/260ab860dedcb68f10d97ac743b7bef8/79827178610.pdf
    • http://tlxzkj.com/uploads/file/151921593237.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/fb0ba997a866f1d0f9f80e5127362abf/12822704795.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724cb1c7d7b---2332722145.pdf
    • 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_off0000ebf7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF7 16792 bytes
font_01_sfnt_off0001040e.bin
f6508818e9c75af1bd875630a316d46f335eb185e90c39682577b0fb61ba51e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1040E 10552 bytes
font_02_sfnt_off00011bee.bin
d99aafde6863b7fd34386c24c434dbd68d02929513b7fd3273dd8b5c505b9965
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEE 18332 bytes