Malicious PDF — malware analysis report

Static analysis result for SHA-256 846f17d9e8846668…

MALICIOUS

PDF

82.8 KB Created: 2021-09-03 11:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: db2dd03104ae74ec523b85e3ba2fd7b9 SHA-1: 7ff61ee8c99006cf63a44c5ca60e2a1799b048f9 SHA-256: 846f17d9e8846668c4b54f7f3225836d819b6c6e309e261802ab07dbae6c9ab9
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=rrb+ntpc+exam+paper+2018+pdf PDF link annotation
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/b2bb285e3edb91fc8049a1b2af420015/niwozuduluruxitategub.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/37714659374.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/94817454999.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/7286522778769f86dd16b3c5b563ed5d/72946338649.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27c7104831---35827669013.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/76057456545.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/xitagejo.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/8227639638.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/fcaacc57ef772b9d5d7ff300eba2cbc5/gozarajufilodozabud.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/rogoxavajufuporuvi.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ec9989028---sosuwizojupupo.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ivfscvn5robmnlpnkknkuuc66t/vunexemijafi.pdfIn PDF document text
    • http://netflor.pl/upload/File/mulopuxut.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/xivaluv.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/16473516591.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3431bc881---31517209448.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/47256162642.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606da72adf9e0---latatonagabudivogubik.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/72204168834.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/topunabif.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/xijenuvojorasinos.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/74ec0e9bcca81370526e9be23208fb0a/pitaxabuvuxokamujixup.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 19340 bytes
SHA-256: 6f4e2dfbd77e709fcd994c7f9525154a07341ccd7471f5094bfe68228217f3ea
font_01_sfnt_off00010ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 11144 bytes
SHA-256: 20abca02513f7a804b2cbfca6e6bf96cd7455818c81793b6892fb7daae129df7
font_02_sfnt_off0001259a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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