Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dceaa24298356d4…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 01:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efba2c035721127bf3c44a8710e1cfe9 SHA-1: d4fc1dfd1599a073a794dd2e709929c465cc80ac SHA-256: 0dceaa24298356d420751bddebcde5e62e8a05e9c3746a5e40655e9b15937ac4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://allytemp.ru/uplcv?utm_term=hunger+games+book+read+online
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/zafaduxokisibudunulami.pdf
    • https://marwaservicecenter.com/nbloom/fckuploads/file/rerube.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450da969efd---16796889928.pdf
    • http://kapfenberger-schuetzenverein.at/userfiles/file/tubefogowarif.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131595fe62da---84900953847.pdf
    • http://neapol-m.ru/usr/file/61140654920.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/816ac8d5806ece7cafa4c012e2728827/91284103279.pdf
    • http://healthywithhart.com/res/file/93208645000.pdf
    • https://darshanam.com/ckfinder/userfiles/files/19550231866.pdf
    • http://akekaluck.com/ckfinder/userfiles/files/54563039411.pdf
    • http://alliance-ic.ru/uploads/file/77776817356.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420bc29daad---22019719397.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143744e70af1---84228909856.pdf
    • http://gfzgt.ch/upload/file/moxawanajipisufexuridu.pdf
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/97715747486.pdf
    • http://czernavendeghaz.hu/admin1/file/jakupasoxobabibat.pdf
    • http://doubler-son-capital.com/photos/files/67392007979.pdf
    • http://caythuocdangian.net/images/files/45961201460.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/naxivijatanuwewid.pdf
    • http://steelfurniturecn.com/d/files/68087031360.pdf
    • http://giftboxvietthuy.com/upload/ck/files/xesujefupetitokor.pdf
    • http://novelinternationalschool.com/ckfinder/userfiles/files/zepamurofulexotatanom.pdf
    • http://clinicaveterinariacene.com/userfiles/files/40464883134.pdf
    • http://chiari-web.com/ckfinder/optimist/files/podoxitimu.pdf
    • http://grafiport.com/userfiles/file/78222368194.pdf
    • http://easyhypermarket.com/userfiles/file/lumem.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da7d.bin
155737274a126a9aedcb6e6a8310c34beba104b5d16048f14e99fc650197aaad
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 10816 bytes
font_01_sfnt_off0000f318.bin
52a900d7957cb3b26ee0f91607ce609e1705cda6b764655e0e4e2b655c581ea4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 17480 bytes
font_02_sfnt_off00012078.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12078 16792 bytes