Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b406916f012cd16…

MALICIOUS

PDF

87.5 KB Created: 2021-07-03 09:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6db4ab672df4a68371a15a6f33936f3e SHA-1: c7bd9718587a57b8072756775b4e9ac6d82cca6d SHA-256: 6b406916f012cd16a2b2bd145a3a98ce1ecd4620f31ddd6b7bf00e9b2485f163
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further malware. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://baikalspring.ru/ckfinder/userfiles/files/jijolukixazojosetezedorid.pdf
    • http://mynigaoe.com/upload/file/20210630224920.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7f606d5c28510ec2fa762f64f2bde69a/27164853996.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/2f3c0427ba8e9ee7faea2a16d808730b/44479667361.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160767b068273d---7290090966.pdf
    • http://exima.kr/userData/board/file/34415730932.pdf
    • https://ibliberia.com/ckfinder/userfiles/files/kofuniwarinevazedelerimi.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e6534d1c1---dudunexutijuxatafinopipa.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d987149942---bejogokazimeka.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f82c90401---55212109836.pdf
    • http://elise.pe/images/file/zupuxu.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607719a4077a3---89177165890.pdf
    • http://evohome.pl/userfiles/file/sokatoluralu.pdf
    • http://romanakladatelstvi.cz/userfiles/file/51304049649.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bb638f0917f---pojetimutawofexakoja.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2a56cb474---jinasefuj.pdf
    • http://world-green-hope.com/uploads/files/59960411234.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/dfkpvgtjqmudd87p3pc23kdpm8/21845525402.pdf
    • http://esrafisek.com/images_upload/files/99861999906.pdf
    • https://landbar.com/upload/files/45725060520.pdf
    • https://deepex.hu/hirek/files/rupoz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=real+life+l+death+note
    • 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_off0000f1e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E3 16792 bytes
font_01_sfnt_off000109fa.bin
c1f8402dc1449e0cd4d51bdc5037a2030452a361cd292359fca5085b6243155d
pdf-font-stream PDF embedded font (sfnt) at offset 0x109FA 10228 bytes
font_02_sfnt_off000120cd.bin
978dc57043febbf4238eae99f9c0fa7bd84252c525545a4b94fe9851cc6dba88
pdf-font-stream PDF embedded font (sfnt) at offset 0x120CD 17904 bytes