Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c41bf80e1ed778…

MALICIOUS

PDF

81.3 KB Created: 2021-07-03 03:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7a996fad9a1151cf3eeba6cd7ab86336 SHA-1: 971546a3b32dbb7f05faeb5024f85af70497a988 SHA-256: 36c41bf80e1ed77853fbb0706567069fa5fc56f9dc683d1e63b96626bfbc38af
96 Risk Score

Malware Insights

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

The ML classifier and PDF heuristics strongly indicate maliciousness, identifying the document as a link farm hosted on compromised WordPress sites. The numerous URLs extracted, many pointing to formcraft or super-forms plugin directories, suggest an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious document designed for initial access via phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4459278bf---56811410448.pdf In PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a261cdd6f80---93370140427.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e2609c045---82284041523.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/3b6844040f2d4a994fbd53cb4334c3fa/75969424669.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf10503808---kosukipas.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/64ea6024674627470c9e86964a70625c/33163861773.pdfIn PDF document text
    • https://marosme.ro/hirek/file/74340746449.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a664f279c8f---58963992931.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/rozigawedataxedagikub.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4f441a414---99693484968.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/76788088313.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/98200fb938022161dc9f9de642823117/dizufojelorexivu.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/24346652892.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/49452456313.pdfIn PDF document text
    • https://dm288.rs/slicice/file/nalarirokovitasewotivef.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/sipesasajowukenonavoz.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/gqhldsii1k1cjj2ndr9sijqdi8/87613283315.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/61602517065.pdfIn PDF document text
    • https://abeess.com/userfiles/file/gubotifixumarisawegulov.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/22556617185.pdfIn PDF document text
    • http://learningkey.org/userfiles/14225364970.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b36f2eb89---kobojuxaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+old+man+and+the+sea+read+onlinePDF 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_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 17120 bytes
SHA-256: 504d9aebfe16f1819ac9a4ae036f68f628ea9bff97a8dd50bee7ccee1553ee8d
font_01_sfnt_off00010834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001204b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204B 10476 bytes
SHA-256: edade76cec29d16e0db15542519c35bf2d329c8bd17198b061f8a0f1f164b105

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