Malicious PDF — malware analysis report

Static analysis result for SHA-256 174df5d0b3ab271e…

MALICIOUS

PDF

75.3 KB Created: 2021-06-28 19:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2d7d14fbe3d48973689f09deacc945c SHA-1: 95617c701c9581226132cebcc97c3f3ae059ff5c SHA-256: 174df5d0b3ab271e0c4bfeec599c99ff8df9db7ba025d98751cb831609c9cd8a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to websites that appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically a phishing or trojan distribution attempt. No scripts were extracted, but the link farm structure is a common lure for users to click through to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b07373d23---savoregiwepemujunonuf.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18e7836f2d---ribirowebuzonesobij.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/7uih65ka6mmaat9livmkk4c16e/sipix.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a1e95990---83041868192.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8dc209bf4---fudewodorituligubomiredum.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7816df96f---namapuzoli.pdf
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/e4aa808c95f558d05750409540084078/29756916718.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/5dli9fvpd5gdqska3hhomkor6s/51668234471.pdf
    • http://akkoryazilim.com/userfiles/file/wilebevinowaloruzanezet.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085497265945---56611836943.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/6b1ff5454a8312bf687cd0db54e6f1ec/82487369440.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9d2566bf---sanaket.pdf
    • http://aimic.com/userfiles/file/nepevip.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3c7a25f45---mobigebinovirifabaxet.pdf
    • http://diysmart.net/userfiles/file/pekiwutujawokija.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f2ed7b986---24401431441.pdf
    • http://csc0311.com/userfiles/file/20210628042554_kh437n.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/a2nuo30o4sbn46kk135b5445fo/63800915519.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/nibugijenoxexitonufaraj.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/05e980bdc1dc07091f395df82b6e1b15/bosasolimirifabi.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/5f3322042cefd7920ca4339c6d744f31/tugaguxelenab.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a03e3fb97---37966998672.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+got7+just+right+mp3
    • 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_off0000ba29.bin
8d1ceb9c05d98995b4e6c9abf328a674c7684e9b6f78c178c36e76579d035680		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA29 11244 bytes
font_01_sfnt_off0000d42f.bin
97c92157f4086bb9a07c9ba3a69bfd4753fc18035de4beba8cbd887708959dce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD42F 20416 bytes
font_02_sfnt_off00010638.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 16792 bytes

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