Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4dc7506acab42a…

MALICIOUS

PDF

82.9 KB Created: 2021-08-29 13:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9bfb9901aa4ce7b5597ece15a22940b7 SHA-1: 4b2826340ed459cc69f2a4bfb00186dcc298396c SHA-256: 2f4dc7506acab42a900a6a153b98c21d0ad99330d93b71316f2b8b30be3fc5e1
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate high maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites and acting as a link farm. These links likely lead to further malicious content or phishing pages, indicating a phishing and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609445c76ff74---28768973925.pdf In PDF document text
    • http://ladyvenus.it/userfiles/files/33486069182.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/vopepuz.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/69f068093959ffeff3d1c3c0127eb24a/70232789661.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/55940256675.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/fozovudopotikamugodejazul.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607906cccb313---60119805810.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/65999465708.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/35114219842.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/veburoxof.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/nubizexitudezevuzakug.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ce48dd19a83---96031231737.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/hj9tv6s1217fv13oopkus1de6c/36129425238.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/73877697519.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/42384685838.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/8630831bd94da41b3815fc74286993ee/28309516805.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/d79f3407d0fc1deaa461c671b98d8b4f/bulexawokoxosipedorimoj.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/68273733780.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/vomiv.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/diwepok.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/40099287590.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3da6b4a9b---85797204034.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/qbhnrnqtqb0on69rs4eim6op86/temugimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+many+letters+are+there+in+the+danish+alphabetPDF 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_off0000da19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 18964 bytes
SHA-256: 2880f9c912871b38e7d3d44c98dc3df00659894e44eec7a18125c269df863b02
font_02_sfnt_off00012423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12423 10988 bytes
SHA-256: fb3be5f6542318a84bd841e78b6de094222559c957cbb7a04c79e021e1186ab7