Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f26ae82caf4577…

MALICIOUS

PDF

96.1 KB Created: 2021-07-05 21:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9c52ee268856eaf1ddbb5b2cc3fec6e9 SHA-1: a46355e6fb75c68b15fcece21ad286287f83c86c SHA-256: 37f26ae82caf4577e268075a9eaed841b4dc26f2981ef6cabf02da509f41185f
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, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely lead to phishing pages or further malware downloads, serving as a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098858596d38---juzeraxowotelugedalozepaf.pdf In PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160856af03d0ab---80427519799.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/25041437414.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba4dc3e915---toxogojare.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bca90e8ebe1---6797215042.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd11264a14---92623768285.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac94d7353e2---nerefupepubani.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/66a65a05857f853f4b8e8e4ac4215554/46777913530.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/8c1ep3lqu1lk3pp2btsdlribg1/walik.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2288175924---dazoweje.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/zipexozixolobutonemufi.pdfIn PDF document text
    • https://moolans.com/uploads/files/rinetezobetilazavoxoxomu.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/dolafosegigojemaxumox.pdfIn PDF document text
    • https://zzwgjx.com/d/files/tuxuropu.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d1974b0bb---50627432433.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c22ddb161341ff3c9b7d5ebdf5c7dd4f/30298175546.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/pabodupikuzakaw.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/281f230726764f2456e18cc7807f80a1/tazokexivujumuxavifisajo.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/klqg7jrjvd4kpvrq94d4hv9ta3/sedozorunonizuxiba.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a459129406e---84375939417.pdfIn PDF document text
    • http://cwesp.biz/upload/file/xawuzusivuxazodam.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/089abbdc832cf09e4232551855191654/sodinusawop.pdfIn PDF document text
    • http://strandedtattoo.net/file/19088773828.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/54019741015.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0617d2711---zasul.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/80a01dd81938e7fc74ed6b1f203838a1/11284402210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=attitude+quotes+for+girlsPDF 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_off0000fd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11593 17396 bytes
SHA-256: 725dc63e7771146eb94ab896817034a4faa749fb6cf5fec5c1e7a33470f28203
font_02_sfnt_off00012e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E55 17236 bytes
SHA-256: 974b53eacf1a73a8418f3b9d181b839a792bf48547b65cb9f746630c6c0d1033
font_03_sfnt_off00015b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3B 10488 bytes
SHA-256: 42e4722f053f1b25235680eab7cbdb1e528964b3f6684c9a0b4ff630d064c369

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