Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4c43e334b9422d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 10:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd136c0689d40d53e0334ea1c560502e SHA-1: 294eb8f5455ac1285b629cc993ef98a958549ede SHA-256: 7d4c43e334b9422decd6a256a9c900af06aa2a264c1deb032e12f1b1222664c1
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It directs users to multiple compromised WordPress upload directories and other potentially untrusted domains. The presence of numerous links and the nature of the hosting suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84d40d0ecc---vakinuzedegusuzi.pdf
    • https://accuratesearch.com/userfiles/file/63422639827.pdf
    • http://zovsh.com/Uploadfiles/files/83099634237.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-6-14/20210614210332473531.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/b57687ed73d78e3f1aaf3fb00131099e/dadozogodezazirufukovujot.pdf
    • https://liniagdanskzydowo.pl/files/susid.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b1c1c6a5edd5486e887fb3669a59b237/2325001690.pdf
    • https://cowichanseniors.ca/userfiles/file/48386693227.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607725dde6ac6---22975220288.pdf
    • https://zemiigori.com/uploads/file/xusomovekupez.pdf
    • http://keyflounge.nl/userfiles/file/42313550114.pdf
    • https://skvely-kup.cz/files/file/dowosan.pdf
    • https://dichvumayphoto.vn/webroot/img/files/12466872301.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/89055987057.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b355d02708e---13423951919.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d102b69ad---ginebipubevepibetizet.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160924fca59210---76058448812.pdf
    • https://dichvuhappyhouse.com/upload/files/37463856228.pdf
    • https://akemi.ro/hirek/file/kuroribotetibejojifi.pdf
    • http://stellamaris.cz/userfiles/56329007993.pdf
    • https://ncsccalgary.com/userfiles/files/72974498246.pdf
    • http://fygl.net/uploads/file/150942362642.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/susogab.pdf
    • http://gaia-onlus.org/userfiles/file/96328837897.pdf
    • http://urjabatteries.in/userfiles/file/89367258158.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e65bf7c21fd---zawexurerovunedanuseweni.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=james+e+talmage+articles+of+faith+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_off0000d9b0.bin
0e0ad64a09bbd82e7e9e5d1cf92fd4afdefe89db2bdcf75f193f8605dff25934
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B0 10956 bytes
font_01_sfnt_off0000f2e2.bin
546998d911b007b1bdcf0d320dc5f27ceaca44651a844f6764e3c36959f8ce14
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 17632 bytes
font_02_sfnt_off000120f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120F7 16792 bytes