Malicious PDF — malware analysis report

Static analysis result for SHA-256 522675d48731c307…

MALICIOUS

PDF

103.3 KB Created: 2021-07-06 11:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6ae6705c82c7301d5951e712ace5e4c2 SHA-1: 2b1bd4838c5d5b37448aa74e009992458d33a9ad SHA-256: 522675d48731c307cd5129801e6ca1e442361465d40c576368a671e3ecf8bf5e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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 http://amctop.com/board_data/editor_img/file/202105250848.pdf In PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa071d49a6---50638827306.pdfIn PDF document text
    • https://tl-systems.hu/files/files/55737478297.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/wiluvuzeredeve.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/40628566264.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609887720c04b---2361360710.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210701_8B4C3D83A29EE4F3.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/40e404b84ce11516db32a997b2d59460/gegoxuzu.pdfIn PDF document text
    • http://renovator.cz/files/file/88669631194.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/bpbng55dvcmqaokcbougc6ah16/notazo.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080a731f148d---82549780019.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce220d882---kuvabutel.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/0gcthnimq3ljkcu3irpd4ophl4/41672355178.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/buvadoginimizedubiroz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13eb43236e---63180137020.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/kopopugizagimunuxi.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/fee43c9f404c5a78f431849a6ee73139/biresesewonisovidegad.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160756d66d6a03---deropexiparibarito.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/tfna6gp5ulmq28jaeng4bob5tk/voxotojulusotagimuk.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-3/20210503010611271118.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a504aeb06---gusiforemeweduzonilifab.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723b70bb858---30852338419.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/9u4adqbvhgklo8gep033lt11dg/sinodopitegexopilasu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160975e546d480---xiluzupafuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=love+yourself+bts+lyrics+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCE 17564 bytes
SHA-256: 9b8bbec051f3e1e35a6382eb6422a959ad6b82b4dfd7ce1d34f151f211911694
font_01_sfnt_off00013ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA4 16204 bytes
SHA-256: 0e6bc4a6964c5bce9a76a9fbe8d538083f0958eea4c7532baff7397200b87483
font_02_sfnt_off00015166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001697d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1697D 11056 bytes
SHA-256: 5cb219d77f453450a4a78993acca1ebb494c8b1236868780251ade116b21b089
font_04_sfnt_off0001834b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1834B 2760 bytes
SHA-256: 9b9db291695559fa64ccaae9c5eb16b970c3f4d4af2c8775fa8f295ca6b01b9b

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