Malicious PDF — malware analysis report

Static analysis result for SHA-256 97bf9781a8cffbec…

MALICIOUS

PDF

89.8 KB Created: 2021-07-04 01:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ce65d49c5ef9222e5c898b5b69bc9ce1 SHA-1: 88349efcf8a19144bf7326a3f68e069a8ddebf9a SHA-256: 97bf9781a8cffbecfb10fbcf5c342bb92a3477c50d8fce151267ce09d3c254b9
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads. The presence of numerous links, including those on disposable hosting and potentially compromised sites, strongly suggests an attempt to direct users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://iamtimeshare.com/userfiles/file/21003229820.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f858598d56---lixuneromoxor.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/55t55m322mmfo8ptt2cplrvi9k/dizipixebixijusilupijepab.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/tugadubivowugo.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607967b75709a---suzupugip.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/10660396702.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/c8g3q9aohq3hi13fo2tioajmu2/sopogakivipozuwolatap.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/sobotaguminogi.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/42c4a1e9a9711ce78bcb80199f606b7b/3353204512.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/67839554202.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/moxunomibamikuvivopunazaf.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607bddf04eb02---33379507729.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/92374239879.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/kigune.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080bcdc1c12c---xonalebirejekibito.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/40352253670.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/43834646851.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5p6fdstq0ocb0qm13c5onb46go/jirof.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/buvedozafekafowen.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210702074957_mheef3.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b77967016---vorupiv.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/0871e073e0117020d9180fca986e84e7/91795457609.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/9ab2fa1289594bb75509e68669935d7a/959827398.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/22182242441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=quotes+to+make+a+girl+feel+beautifulPDF 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_off0000fda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 16832 bytes
SHA-256: bc3dc17bd16fc927c3db9deb99d66aee81057e59e97b48ac7d5e47bf40e57272
font_02_sfnt_off000140bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BD 10844 bytes
SHA-256: 1f12f7e7be4c14bd9f5be1a12f1ed232ae98eae6b4d4e62b324f3349b9d9c357