Malicious PDF — malware analysis report

Static analysis result for SHA-256 d609b4fd891ba86a…

MALICIOUS

PDF

90.8 KB Created: 2021-07-24 23:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a1910ec09aa479107c569ca89448596f SHA-1: 9e6d5c83a9210ff44825c0fd624690f397bb3cf4 SHA-256: d609b4fd891ba86aeb05ea6ee4869df7c42c664506b6442275a49ef81c975f8f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure of the PDF as a link farm on potentially compromised sites is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/5oleb8ui5knvb78u70et99l3s8/39516585514.pdf In PDF document text
    • http://samurairamenbar.com/uploads/files/mikowupitumixejetovufabo.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/55921966630.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/66533158982.pdfIn PDF document text
    • https://wecareprogram.org/images/file/99254748010.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160878cb85a033---30168176547.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/gusumipa.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/qdamjg6ego22g0fuoqdrr4l76f/4412067481.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/761ba37814d5dd21d4943027a093edda/rerowetifaneda.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/38cb0121d97256645369dcd9a1f4ee8c/pinesitinib.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b2df1b273260caa251efa79555accc8a/tinimepiv.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/gewemidedajoninawifevusi.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/2c8dbe1a08d5d3d2bcdac62db4abd101/76650481488.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f3f1da73---kovaxaralisusidut.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/rowin.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/77316911697.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/dvs0a6mtb2lsg7a5vrje5cjedl/44351888919.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f36e40414ec---balapolumatofuforiloda.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160f6c98ce70a8---xajuloluseroligufovo.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8a098da0c---28465086147.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16074b9fe9fc13---fugul.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2a8ebd56268158cbf278ee6bd91547e0/87118918846.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/763451796c8a5c4c30524cb075803ce3/rukutumesegaf.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/zufimifutifep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pmp+rita+mulcahy+9th+edition+indiaPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 18120 bytes
SHA-256: a704c08e9eabee853f5bc250ea123ba6a849210873b2c08e5c0567138da13943
font_01_sfnt_off00012bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DA 10992 bytes
SHA-256: 2909997be2a1c2a7d3d445ac8b97070ee09a0d6104be1955bf117f9856ae1035

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