Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a41a03a4d2befe…

MALICIOUS

PDF

92.1 KB Created: 2021-06-25 19:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c43fdb6f1276d7c598864b3333ab3ed SHA-1: 1aedf8a7170a5896db35c8425680c012e6c2b05f SHA-256: 92a41a03a4d2befefeb183ad6d94666e604f6d7bfb600a50ec960187e46a4cc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://patc.fr/imagesfile/45375026829.pdf
    • https://cpsguffanti.com/uploads/file/91384829697.pdf
    • http://nowyhotelik.pl/userfiles/file/27976825849.pdf
    • http://strandedtattoo.net/file/38145167437.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/bce543f9b3406fd4e7cff699bfcff563/vosupojifodazomepitunepo.pdf
    • https://partnyor.az/userfiles/file/78368688946.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608794610179e---53964851540.pdf
    • https://grupo-kayros.com/userfiles/file/zodusederaduxamipa.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/63f979c1b956a618ffb14b85744826b3/rositaniniro.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1031b4c1e---kerovanetiwonovepida.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/016b9cdaaf0467a23490bcf4f3a46750/wajixeluzewoxomevaxadi.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/1921322466.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/63ja7adfg8kp39et3u16hefm6r/88651343685.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b154158c---33128441003.pdf
    • http://jinanxintiandi.com/userfiles/files/36054049748.pdf
    • https://okud-istra.hr/userfiles/file/86852721130.pdf
    • http://learningkey.org/userfiles/kibofopomexos.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/gekawogop.pdf
    • https://poolpoint.be/uploads/file/xogoxow.pdf
    • https://bandotrading.com/uploads/file/91426119376.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160aa108c9fa25---29730800152.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609859e179adb---25987703752.pdf
    • https://aljuboori.com/userfiles/files/juzaredife.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/93bb1f18b0abc34173d7802a1a8a39e0/82403791138.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dave+justice+net+worth
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf5.bin
186034194d535bef1086afe5e58da6f4bfbcb721aaae67c74a499697a78631b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 18180 bytes
font_01_sfnt_off00011bde.bin
1957c7158e46d2a1fcea66bafa400ac9ebca94e16e515df6fcf3dbaa0e857b8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDE 16368 bytes
font_02_sfnt_off00013236.bin
776e5259e3821f603b390f653a8a53390ed3e4eda3e35bceee260c6cf710698d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13236 10664 bytes
font_03_sfnt_off00014aab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAB 16792 bytes