Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f190c05d7e230b4…

MALICIOUS

PDF

93.7 KB Created: 2021-08-11 05:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: adbd7be27db478faeeec33a53ae5deaa SHA-1: cdf91e9fd40c4c78154d17087276116143b3e0b2 SHA-256: 8f190c05d7e230b4f837680e399e9ff1e3f458256819f50ff2df5cc6b261b6b4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://juniorclublivorno.com/sitonews/images_upload/files/62169770265.pdf In PDF document text
    • http://vitaminyplus.eu/files/file/58827466904.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/judogegesekew.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ra5lco15iki5psi8e5nqiekjfl/36399077283.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/kunak.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/lemuz.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/lagasebasadisesosuxaga.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5daa620596---vikelegivebujemogala.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4c6e10c73347416a3a5e24ac72c851fe/xowobojaxusovowegono.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c64191c013c---97702138532.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/4c72bd62c85db73efd02e496e298d97a/47487316699.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/66827591524.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/4030060974.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/27754644941.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/dadg7o94dik6n9pg8mo6dmc896/rujepoxuwarulipakonup.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16070c2957170e---kekotelosoludawoguson.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/uc072dst8v8vdnmgodd7tlufu5/58134410167.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/temesikap.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/zanatokubifilugu.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/visokapusalelut.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/zazivewodot.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/simeriwe.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/ridoluse.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/90648650309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=l%27accord+dans+le+groupe+nominal+cm1+exercices+pdfPDF 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_off0000f019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001082b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 18276 bytes
SHA-256: 989b9e59faf9a0cefa9c3384fc2acf4dcbb53a17bc2429f7017224577e9d95d8
font_02_sfnt_off00013613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13613 11108 bytes
SHA-256: 116688e3b19fc4cfedc664433ad921bbe3e5dbda883a0be60ebcc28e7c3f19b6
font_03_sfnt_off00014fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD5 16488 bytes
SHA-256: a85ee11492a967a10fdc1e82423d3c8416924305c14524b91852a8aa75878ab5

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