Malicious PDF — malware analysis report

Static analysis result for SHA-256 f977ecef2e60d0ed…

MALICIOUS

PDF

75.2 KB Created: 2021-09-22 15:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 44084c698527325abdd8e08adb9f4e91 SHA-1: fa5642ffa204293c2c95bd76ec9be23934c988cc SHA-256: f977ecef2e60d0ed3261fa3376975a5c5301e04cb2482fec853efccf59e079f7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable domains, a common tactic for phishing or distributing further malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly indicate this malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://tekartltd.com/upload/files/pexoselotowemigizovowegi.pdf In PDF document text
    • http://miyagi.chi-kara.net/Upload/files/fetopokifavoz.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161408b6742f63---bakenut.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/dasodevodabunime.pdfIn PDF document text
    • https://soechi.id/userfiles/file/wapinofasumuta.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/080648102369.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/rosuwimaxifu.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/jufubomukebinelibedimeno.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/28231483878.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/6950428698.pdfIn PDF document text
    • http://compsult.net/userfiles/file/6404036313.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/ginusepus.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/43358028596.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/fazufoza.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/godal.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/51573689145.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161325687706e2---nipeva.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5f5e7e963---70406480211.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/merawibujovexetafeped.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/dedoki.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/63395244393.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/63912642298.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/juzisedujiduvagofofosow.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/sejijevuz.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/a114a9d54dddf82e206a305b19a870ee.pdfIn PDF document text
    • http://premo.at/userfiles/file/jararonivasolugojod.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/88256056357.pdfIn PDF document text
    • http://bubb.cn/up_file/file/zapemaxoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=movie+box+plus+apkPDF 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_off0000c551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC551 10436 bytes
SHA-256: 261acc520b348ab1db507c8c5cde7e5b842f44bed42590cb8c21578ff9cdd8f6
font_01_sfnt_off0000dcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 16500 bytes
SHA-256: 2e23dada465ae3d48b8c5978e4ca95b74cf4c82cfe6907c97f14d00cbd839cba

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