Malicious PDF — malware analysis report

Static analysis result for SHA-256 68de07440913dad7…

MALICIOUS

PDF

85.0 KB Created: 2021-09-12 10:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d070800c5f48386d8e5b9c77147f8fe5 SHA-1: 44b9e30ea638750c4033bf2c70fa14700e9111ab SHA-256: 68de07440913dad70dc4c337898e8583d2130ae868b303a791d54540b58ed579
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=fast+and+furious+7+full+movie+bluray+free+download PDF link annotation
    • http://ahxxzx.com/userfiles/202109/file/samuferebome.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/58345820170.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/1708046274.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/muramowatajerivemepikav.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff2d116fbd---43832355085.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/refaru.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/4492abfe7db1357f55d25576420984d3/82039606158.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/11399073500.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/nesojemal.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/37302577243.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109111425473387.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/zoxajuzakemapanixagus.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613babcd6af6e---rexeki.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/fewumimeriwivudutefi.pdfIn PDF document text
    • http://btfa.tw/upload/files/43280165661.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/3875672133.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/77600943691.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/kerefizazapifej.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/97564820767.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/36654232394.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/69955416450.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b30a329b8---58418103237.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/37349119666.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_off0000e0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CB 11048 bytes
SHA-256: 6f6afb22e56d40da7eeefc10ed46ba2c449a9704ab7af5fd0ac5781ca2a49a5d
font_01_sfnt_off0000fa9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9D 19588 bytes
SHA-256: 97aae3c3bd0afa11608286ce062a3f8885d2359c9efdd8f7d03755b557ddc7dc
font_02_sfnt_off00012e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1