Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e6c8ac7055257e…

MALICIOUS

PDF

78.8 KB Created: 2021-06-26 03:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 70e1f7135328e7110fc7450035e504dd SHA-1: 3eb2a30c7f7c6e2509ea3da4ee36a080d1c22923 SHA-256: 23e6c8ac7055257e2f72372d580506db29b1458478649969ffa070eff23d4060
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The primary URL, https://medvor.ru/uplcv?utm_term=jackie+chan+snake+fist, suggests a potential phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://medvor.ru/uplcv?utm_term=jackie+chan+snake+fist PDF link annotation
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076737bdbe7c---81839352092.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/182b4c9b9a119b16364c75c1618ffde3/4725912767.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b0077391e---dufetolipugejasufib.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e407cfbe88bdd2c910446f050b7793dc/jojenoxa.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4c0368eff---87637455237.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7eaadb913---34891573453.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16094ca0631c9b---39560174011.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160727f60962f3---57591978416.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af6e4d86d5e---repisixadakomufilunije.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/mawojoken.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/44323238465.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/75894173143.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16076d7354a620---29813806076.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/0a27ee6627a92cc486e347e5d86d0c07/77109594553.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071735378a82---gevoroji.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/7k6gi9edc9ukm4kkg8ltsip7rb/61911953940.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad83cb84d---zutivubidog.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/6018563008.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4907a016b6---belosuko.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/16915153488.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc922c7a0---rorokigobabe.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/tubomevuwubelupewek.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/07f247809c6001806d2bc1f0d64e0c58/28584052854.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/90b177835fdc621c2bd198607fbd1136/puxozarosonisatusijofik.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/9e9b295ed3a30ce481377641b59f4b5f/10121123447.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 10248 bytes
SHA-256: c37a1138718812b091ad926e7630f72833087a0cc3e15abcb89ad5d12f40ff05
font_02_sfnt_off00010059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 17724 bytes
SHA-256: 2afcf7a91fd6c949ae849d3a6491d0cf628e7e4a3ebc0cf0a5a20d1570d6c6e0

Open this report in the interactive analyzer, or submit your own file for analysis.