Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd8d8b474bfd84b…

MALICIOUS

PDF

86.8 KB Created: 2021-07-07 00:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e9a057aaada3da23eb367fbd05e6652 SHA-1: 70db0013c644236fdab9050b06f88b9c0dcb7b28 SHA-256: 9bd8d8b474bfd84b0d61b78179e59d662cb6afaa2150bab4b8504892b02d28bf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised CMS upload directories, including WordPress sites. The presence of these links suggests an attempt to distribute malicious content or conduct phishing by leveraging seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fffe7b34b2---5186241973.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/59497790431.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0f9453bf8---parifizut.pdf
    • http://ngor2-3.com/file_media/file_image/file/62862608427.pdf
    • http://qtjdb.com/UploadFile/2021/05/11/file/20210511_105157_103.pdf
    • https://allianztc.ro/files/file/sukizuzetexawiju.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/ea5c3b05c06c0b0d84f5024295877392/fubebotidisoreteseroben.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/aff279b756745d92ce01822630a00929/kokedesodosufufefun.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/0lrdvqlufk8u3259s1jr0pvrgf/jubanewavevevurozekuxo.pdf
    • http://nusratali.com/userfiles/files/16173218245.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8e1ab09de---bapozajojiwevawumefebivin.pdf
    • https://nanosoft.mn/images/content/File/85578490711.pdf
    • http://zwickerfoto.hu/_user/file/kerin.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/42435630769.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608369f711bb5---17565519868.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da08131e820---kepadanuxifel.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081618bdea11---popisozanuxomonapalixevel.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/30d58ca1252a69964fdfc931cfe5e97d/nosob.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c4ddf3a1d24b3c84df1433ae291a013a/6217818990.pdf
    • http://sirmamedia.com/ckfinder/userfiles/files/tawevipa.pdf
    • https://ncvpte.in/userfiles/file/saxuvewenitiwusalabexum.pdf
    • https://zemiigori.com/uploads/file/65300071528.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac94bf8160e---29808108433.pdf
    • http://chickendaylacrescenta.com/uploads/files/mawodo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=buy+to+let+conveyancing+quotes
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/474f17a29d33b2ff7e3f3a7abd4a244c/50982758843.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_off0000ec42.bin
020b55fca3cffb5ea1b9f45da0e56c44c4e9f2b1fe69f854cb993f85a754d4bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 10784 bytes
font_01_sfnt_off00010508.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 16792 bytes
font_02_sfnt_off00011d1a.bin
32eb20460cbad0947e50d341c36b2b8abf607e8d9ad61c94b149f2cb2ef6e25a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1A 17832 bytes