Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c07a7e3f296cd2…

MALICIOUS

PDF

91.7 KB Created: 2021-07-25 20:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: be30322c919a32592fb1084a5271a4ab SHA-1: 55177ac90e4e713686d6a0da9265cc49c08b30ac SHA-256: 55c07a7e3f296cd201b9646734266225979143b2a77d9beddcfc4caec53d0b19
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://greffedecheveux.center/upload/ckfinder/files/mizabobopobajejefebadila.pdf In PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/tefafenisexib.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/pejafideto.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070222bb1eea---muvolopotezebotawofotakij.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/94653142838.pdfIn PDF document text
    • https://norservis.com/files/files/kibitunezet.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/kuwugagizaniwibixaweraf.pdfIn PDF document text
    • http://africareview.in/userfiles/file/bovofanukaluremubamenev.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/3389602630.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/60fa70937158ab216763ccbad54aeac0/15164809717.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/f3ngooa7b13u8csdqcqlcu7v03/katopowavi.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/9570597914.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160756cd307c8a---ragekadizasanibul.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/at036jb905ndr7kcbjoc1tg78j/zuximafepono.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/74639187934.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f213eda8a64---dowewupedulojikilotasotex.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/57aa318e670ac721ce6754b3646ec698/zugagiwalit.pdfIn PDF document text
    • https://vientangluc.com/upload/files/63758570853.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/xufixupapogutitosigifax.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/31497517410.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cca2c55477e---sijipaxexakefojeronokodul.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/11167354266.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097785c3dbd3---152379996.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/guminaru.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/nufowikesadivivikukesefu.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/xurureg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dieta+para+perder+panza+en+una+semanaPDF 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_off00010266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10266 17716 bytes
SHA-256: b5a9d2c3163890d26bf07e4b21f5d7654f91439f6841741414654725638f96fc
font_01_sfnt_off00012f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A4 10548 bytes
SHA-256: 1a82be02fe960fae46337f8efe5305741f1e540d2ed31fdfdb5551da7203c6b7