Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2d670410e67dd5…

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 18:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57ee3be683b263fbaf9d068f307e1c88 SHA-1: e0cf8a967f1f1af1f66df693fd338f8d634345e6 SHA-256: dd2d670410e67dd58943b6b947748fde62d439a660e4f7cfe6b92969a2c26895
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 WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farms points to an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cabsfromheathrow.com/userfiles/file/fugogexawasasonaxofufipus.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pjp4ridltcalv28c5u56vjr5d6/28557733320.pdf
    • https://cyklo-wellness-penzion-palice.cz/content/51832713540.pdf
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/xagulitopupu.pdf
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/68596332952.pdf
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/18979416964.pdf
    • http://jjw-led.com/userfiles/file/dowerudela.pdf
    • http://coimbrasoftware.hu/images/uploads/files/74521843128.pdf
    • http://bsa-billiard.by/images_from_html_editor/file/mokeleforigutabuze.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/98271579287.pdf
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/durumapuwo.pdf
    • https://pezenasenchantee.fr/userfiles/file/neserugesa.pdf
    • http://erfanekeshmiri.ir/userfiles/file/11027590472.pdf
    • http://eg-connect.com/uploads/editorfiles/file///31832601072.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/rakozojikukusukilisuvap.pdf
    • http://www.coverseg.com/uploads/ckfinder/files/mezefajamupari.pdf
    • http://kvrhousing.com/uploads/dodanizagadugekufulozoxo.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/bulidafaziwavuralige.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139b363c07bf---pategabalirulawoposulu.pdf
    • https://eternalbliss.net/file/niragogabuda.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/f8ra58bls01hrh3raak4tt35qi/jebalititone.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa16177d37---tepebefevukubupizividajop.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/7588d84b90b2415fe1131b20b19f6c02/26675992749.pdf
    • https://anglarill.net/userfiles/file/saruwolovif.pdf
    • http://zhouzhuank.com/v15/Upload/file/202196214444172.pdf
    • http://omonetach.pl/foto/ilustracje/file/venebifaro.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400f48847ec---gobefujexizefi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=sinhala+language+download+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b73d.bin
c92e215ef2f7f6ddf387d2e4e50361ed351f191e200f3420600bf78499a0b73a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB73D 18352 bytes
font_01_sfnt_off0000e4aa.bin
ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AA 1820 bytes
font_02_sfnt_off0000ed34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED34 16792 bytes
font_03_sfnt_off0001054b.bin
3b8fe1b6ad956fdbba6e934fd957e247d60216241d9a4624c91fd47f1f85a834
pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 10628 bytes