Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be30d3922b141eb…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 14:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 328307c1a169bcc75f85aa81893e0638 SHA-1: 3de895f3eba2ccfcd36259aa8f14b1530552f1ba SHA-256: 8be30d3922b141eb245dd9e05ebbe1c937b90292e4b1cf64cd3f2fbb746a6740
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the presence of numerous URLs on compromised CMS uploads indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/d811cfa0d8522280046829c1ed35b509/mukudamuresumibi.pdf In PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/didarovatexasilusowi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948a2c38a9f---65051021878.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/76285810507.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160828e60e0057---84655890786.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/043cdeda893f2e23bf967905aa206e36/taxakubinoregosebox.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/57875772005.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27095b4e7e---lobonumigakunalutawesumil.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/lapopuvomazilaf.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/zunotubigawapaxase.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202108031526292916.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/voxaguvitogotus.pdfIn PDF document text
    • https://studiorampinelli.com/file/41191911070.pdfIn PDF document text
    • http://temple.mo/userfiles/file/61243417457.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/forunisiroxoxarixujidex.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c475ceee074---5373256730.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/livenagutekafarunafubodis.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/1cc63d0ca302cbf0cabba80813b4e95b/5720878672.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a97d6302e42---ligiwosab.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/71493523324.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/97484f12005a8482de52827d57055734/69197371463.pdfIn PDF document text
    • http://gewald.ru/content/Files/bujerutejufe.pdfIn PDF document text
    • https://immobiliaresancarlotrieste.it/file/rokawufizeposukim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=champions+league+2021+volleyballPDF 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_off0000d055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 11244 bytes
SHA-256: 2d04c7042a77c2732f5501694e015682757f417c70d25a5eca747e63ba7befd3
font_02_sfnt_off00010277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 18684 bytes
SHA-256: 8a9ba020385ccf0f64a81e59163502a330c64997437f302b9f88c8ee09e51db5

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