Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c65b5cc1cced3d…

MALICIOUS

PDF

115.0 KB Created: 2021-07-17 15:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2abb9618b9ee946b4cec8841482f7d86 SHA-1: 971ba2028f36cbbd5f64f2057dcd9f5f045a09e4 SHA-256: d4c65b5cc1cced3dd0f58733ede52bb49a8214612bcbff48e7d5ff6e5931ef21
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8850635aa---wilemapijujutow.pdf In PDF document text
    • http://anhbanglaw.com/userfiles/file/viramegamij.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/fagofemikojal.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d76e03b22---79525217828.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/7bdmcjnin0a5te0mq48v6rfj1u/pavepubobunetuxiwizevo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/kf3cgmrcb0vrha7evhq6u1gfu2/9511713035.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/6a17b8c779c2ef9cdb1759f88dead106/mupad.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087679d0fc4d---fedugabuwuvuvo.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8b60813e1b28139549251ee78b781142/75709244102.pdfIn PDF document text
    • https://europartner2.pl/uploads/tigadeso.pdfIn PDF document text
    • http://tencanpowder.com/d/files/xexiwovebuvonotaxenivogek.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4708007cf3---wotedopaxitirot.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a92e40c5f9---puzila.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/xowula.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/panekugupum.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b55e0f21174---56292556479.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/co8dbafblt09662bkmdjassk45/vakawobuja.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160859e7658666---lekufakutazejitade.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/45027001564.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46851f119f---xewekobirugebipegoxe.pdfIn PDF document text
    • https://areicon.com/images/file/8345151276.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/seviz.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/92f9ce91caf8c64cc1c40882176744e3/49023182807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=who+owns+whoop+strapPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADD 10160 bytes
SHA-256: 6d5188c62728100590237c52d7a0809c23de0839cbab01f4b97853737a931698
font_01_sfnt_off00016195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16195 17564 bytes
SHA-256: 972df5f4f90cae4e4b916e57f66376acc90e46608f7d268c5d11afc12f4caaf2
font_02_sfnt_off00018fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FD4 16396 bytes
SHA-256: b7167d829de35595304f1dc60e1a0edfeb1e616176f2fef477d818d59702dc3c
font_03_sfnt_off0001a65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A65D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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