Malicious PDF — malware analysis report

Static analysis result for SHA-256 028d9ebdabf7e918…

MALICIOUS

PDF

116.9 KB Created: 2021-06-22 16:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 52b4f271e24e6e00b551c4371a5fa997 SHA-1: 33960b4bd2132620a7f6ab109c6fa4a3de498217 SHA-256: 028d9ebdabf7e9187d7525440a9ee3d32fa48d0d06d8bfd83d8a05005472c469
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://inwebjor.ru/uplcv?utm_term=surah+yaseen+tilawat+mp3 PDF link annotation
    • https://pensiuneavalentina.ro/app/webroot/file/6735605688.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/31869862170.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc60cc1cd---16609800705.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/8fdd3a8127f2a00afc3de511f75a7de3/rinorujaduzag.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/fb29biamdjajm0rh4pbmn3o9na/73391667619.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/13h7llisdlku5ddnhotraatq9v/ruwagejatizugopo.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c896a571f39---tonemunapowejonoledipa.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16097f9496da04---51677729985.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/livov.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ab2daa81e---jitazejigiso.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16086f5aef29f5---27279745428.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/danugaduruvi.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/61652689626.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef8313deb0---tonasejovut.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/037b99cc645de8240e91905bbdf50add/bukafegamujelepawadediw.pdfIn PDF document text
    • https://bizziroute.com/downloads/tilawat/surah-yaseen-mp3.mp3In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00018a91.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18A91 32356 bytes
SHA-256: 7d2d6c9ae004971ad38dc45f727f70ac3c653377de4255eaa0e5f6e47d3ad790
font_00_sfnt_off0001412d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412D 1636 bytes
SHA-256: d372f978bc0864edd0e4f070bc1a804c10434f3d9d7da17a532c0134366d0db7
font_01_sfnt_off0001496a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1496A 5520 bytes
SHA-256: c34d507f7cf8ee03308a215ea47db03ec62b04adc40256db8d79b349858cd9cb
font_02_sfnt_off00015c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C16 2572 bytes
SHA-256: 79e58904956f7bd7cd23f0938878bd7ecace041b6c7b1ed5a84282fdad411dc7
font_03_sfnt_off00016708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16708 10352 bytes
SHA-256: 07c516ee8d2470ef492fa67fdcd6da46453a73b1a015125f127e06b7abbdc7a7

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