Malicious PDF — malware analysis report

Static analysis result for SHA-256 5822f30f20b57a64…

MALICIOUS

PDF

86.9 KB Created: 2021-07-03 07:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31551e6cde3a6434c092bfb353f45974 SHA-1: 65a1b439b32266ccaabd132cc2dfd5ccfddd1b2f SHA-256: 5822f30f20b57a645a58430bf2efffa147f52b34b75997dfcb38a46b54bc2c47
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://garglob.ru/uplcv?utm_term=facetime+audio+android
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d9195ad31---20256477432.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/dovedulijekexuj.pdf
    • http://podlahypilat.cz/admin/file/50806250719.pdf
    • http://chinajessie.com/seadata/data/uploads/img/file/16246435319.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/k5v4fdq9m9lh8r53l17dhdube2/navam.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b480a8764---74510869290.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8ad104abf---navosinipujolexanuw.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/95329475134.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4866358b8d---70985028617.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/15758285586.pdf
    • https://ka-base.no/images_content/file/jemakefuxinada.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf162497c---48327875716.pdf
    • http://agataklimowska.pl/userfiles/file/wavalerexerejejaxebu.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160850805996a5---pagexizanebil.pdf
    • http://nedirajtebosnu.net/userfiles/file/29183269816.pdf
    • http://churchtextile.com/userfiles/file/19425714630.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9dc358660---7537338079.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/190c44cebe3d69acb749957750112ae0/34316060760.pdf
    • http://faxik.online/ckfinder/userfiles/files/jamuvefajajanunuwoxujof.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609109b44e55a---xemegenugesukawukas.pdf
    • http://chukgoobok.com/files/fckeditor/file/nevameperemi.pdf
    • http://dahchen.tw/userfiles/file/7576794128.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_off0000f1ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 16792 bytes
font_01_sfnt_off000109bf.bin
293be88f6c6ad953c943235951e2bc2812d64344d947c386eb8acef241c7d367
pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 17404 bytes
font_02_sfnt_off0001373e.bin
3628208325f644d5d0c6e92a143d836a23586462c28bbc34f5288a1b172f4ac7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1373E 10396 bytes