Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1a017e414c5eec…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 09:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c27928a3a37d8ffe1dc2938d947c79db SHA-1: 988b2d3dc7b0e8a5925e03a577f8d006b1c0df33 SHA-256: 1d1a017e414c5eec7970b15806db467f29564fac26b7d1f037a8c70041e20b91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of external URIs and link farms strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=any+new+messages PDF link annotation
    • http://vdtonline.vn/static/uploads/editor/files/nagexames.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/klfv6fq4b4a1r3btf143eh1kih/zifixaruzumabokawiwod.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/nudabugimag.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0a72b09fe---fodopotelefaparukegifub.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/81578332675.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/votulifunafigelug.pdfIn PDF document text
    • https://airshow-bg.com/file/79345806190.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/82542032964.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/kipimugoxejimegaxuj.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e0a951184---99609961148.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610faa6e02f4f---93909230867.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/6o272f9efvrim6dc2eqhmu5gkr/fexaganudowivepitogawis.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4e2b40a79---mururowowa.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210629_52DB8C8B02A88501.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/jazimisesenakosope.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcb4b214e1---54746905840.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa127a0e2---61507269415.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/xagakopemabobabavaru.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/57760834567.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f6abcbd43---wujutikowotaxot.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a22e7e4f559---wefub.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161233da83088d---80002059742.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/muvuvodox.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f63eb2ec44---pofutozalivamilud.pdfIn PDF document text
    • 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_off0000dd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD86 18064 bytes
SHA-256: 273a538d3150f443fd298fb28ac0fd3a9cd6cc004078d89a1c4f0cc3170fe55d
font_01_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 10176 bytes
SHA-256: 6dd3b2852362d1f67195746f7c41f157e0401f51a514eafa4613eee4f2b6ef2c
font_02_sfnt_off00012333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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