Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c18c53265ee4a09…

MALICIOUS

PDF

75.3 KB Created: 2021-09-16 12:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7690c5db8c3d64417b6b4a687568ce14 SHA-1: 7837e65bb837fcb686c9285781e754d524594a63 SHA-256: 7c18c53265ee4a099a0d3cd1676e9fe477f9e6ded0b5453959cf4255539a625b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://eurotig.ro/file/tiruvivadumezagu.pdf In PDF document text
    • http://vaynhe.com/upload/files/kafesenas.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/eb4a230220d8af8480911dd3a00fb0bc/fokam.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/godezuxixolesasovubum.pdfIn PDF document text
    • http://teraval.cz/res/file/31297429031.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/86939826677.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/pemumedafuxosesa.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/xazowibazetadeganup.pdfIn PDF document text
    • https://panama4d.com/contents/files/49562312829.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210902145254.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/sugivasiliderotijoje.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/94351765390.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613553b4dbd65---gesijotot.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/43716323320.pdfIn PDF document text
    • http://biosite.ru/images/news/file/39633907590.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/85352717677.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3b1gmv89ppoq8b5c12ahu798q1/faferiwuvowesid.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6134d1cc8dbe8.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/faxijujosoliz.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/dutogitixo.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/9697647591.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/57825341892.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/6262498628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=wtfock+season+2+episode+8+english+subtitlesPDF 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_off0000bcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E7 11452 bytes
SHA-256: 31743557b7c2dce2913ee7d3c98a1ce084a3be908f26c698d298a1202b3cc146
font_02_sfnt_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 18080 bytes
SHA-256: 8f322b2b785dbbbb0662358667d47f8961cb9905358480cc89b4eaa4cb941e7f