Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbcb178e6f4ee8b…

MALICIOUS

PDF

82.0 KB Created: 2021-07-13 00:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1d338ca77f5a48d218a8901462baa1b1 SHA-1: adcbaed90589d5984a83e120f3653494c6fc1281 SHA-256: 4bbcb178e6f4ee8b61b9dc75a5cc0e5b08046ecee1ddfb4f9f2d54b9768e1f23
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bedcd16bdda---milobilipetek.pdf In PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/3e9c5c2bf6d1784104cb8d05cb104a65/32839748202.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d62fa766d5263f2647ca070fb6f6b122/veletivib.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/72554432734.pdfIn PDF document text
    • http://rc-modeller.se/images/file///95930182035.pdfIn PDF document text
    • https://naoshima-habitant.com/48096523635.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/eac7afa835fa46a1bfa5dc5fe0b6dfa9/duvomaronumugonakoxugero.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/padelelezakibemagidoko.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/13760072724.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/0bp3hsfm718uui2eua07qilft4/mowiwukuvekote.pdfIn PDF document text
    • https://vestol.bg/files/file/jofapaselemivijur.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/eju193jfiucrcib25ulkk2fvo4/91890039943.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/kodegetotajuzalado.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/nejixe.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/fajadi.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/2lb8r3kqh8c0v7t5ucgvi1st11/minolebi.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/0ba6e6af061071cdafde53a085afa80d/fuwomikikipugaf.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/301800183265.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/4fe07fad414f202ac537a607d0e202b8/20492670954.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/72c3bf65443c1ab8fb813fd7803a454c/43936819136.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/b04de01dd1f6e471000e2cff480c40ae/detowigaliba.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/zugojuzoporowimuxoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=class+10+2021+sample+paper+with+solutionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF0 17520 bytes
SHA-256: c93f09907f27cd95a930c7ee4a8eddf837a574384945a6b304e46827d256de8e
font_01_sfnt_off0001090a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12121 11028 bytes
SHA-256: 7dbd4bf4adfa300990e811f26fe20ad89614836dbb23d512d0fe5220ba704e00

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