Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c1c548777600d6…

MALICIOUS

PDF

68.8 KB Created: 2021-09-09 12:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aac922e4b33d370514316f87abc75cb5 SHA-1: 79a19932099679a968069b0252dd63b4c52c4ea2 SHA-256: 93c1c548777600d6bef39f76d6f8f5ca3dd2daa4af8431d73619a9b183cb8877
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to various websites, many of which are hosted on compromised CMS platforms or appear to be disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.naraihillgolf.com/admin/userfiles/file/risazub.pdf In PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/89450619797.pdfIn PDF document text
    • https://ahha.az/userfiles/file/20685809548.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/17641601751.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/fazoluzapuguvofiwi.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/12916709984.pdfIn PDF document text
    • http://househouse.it/userfiles/files/wawesidomogerajikezaji.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/6fa5bc3808428b7846b00e8619593a74/golusujosubosavugez.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/14385439170.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/15c22358d24250688973b82ba876d8d7/85015179042.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/pavojo.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/89229347540.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/89331987482.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/21843720044.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/xuxusetuvusimugi.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/98930541288.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/dugavexivegubojow.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/38659191833.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/11306324706.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/ruzuj.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/ca624b348e6b1011599c6563dcb9e9ad/kipimak.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/24035478630.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/gugut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=clash+of+clans+hack+ipadPDF 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_off0000af86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF86 10508 bytes
SHA-256: a08d9473b23e9dfc73964bc9b0ae4802740ec8caf11e1bc46e02acd7928c10c1
font_01_sfnt_off0000c758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6A 15292 bytes
SHA-256: 27ba759d0dc51cd46de7a0853041232c6624c08677c7e8701e9b79f2b5e02477