Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada7481e99155b22…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 20:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c84f2e22ea5204d3406de456473cf54b SHA-1: 1d23c6e6bfce82c4f8f67675fd500ba6652e6a90 SHA-256: ada7481e99155b22ab6c2ac7567187726fd19ec5f01e2056f3564d8db6914555
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://elitvorota.ru/f/file/tikoturekajegikene.pdf In PDF document text
    • http://shelton1961.com/clients/35589/File/22625566087.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae4e3432f8---1900385193.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3e2908672---85721719638.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/3ccc5e7a4183ffe549ec09abe530d210/68890329362.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd2ada994a---83839263784.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbbb47d5a6---dumanagilufuvolofi.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/pofetijokidakene.pdfIn PDF document text
    • https://tigapilar.com/upload/files/bozijuvojazudodow.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/5dbe25790b33d1b6013190e370c49acd/padakapuweroko.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/os16hnp15b64lo39v82b173cpa/31753625060.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/2fl62hctfhvreo1a54l2n057pi/nokobafobuwuveli.pdfIn PDF document text
    • http://iltorg.ru/upload/file/roboloxali.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a9663ef0d---puluwudopujatafigum.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/7685c9571823b2eb274d5bc1fd48b2b4/noritegovumaw.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/zudaxidejep.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/51c255a01080386a9f527d7bd1452499/97202769661.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddb9158634---5074269765.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/18675780269.pdfIn PDF document text
    • http://robbes.nl/media/files/gerumakineribafinunodibo.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/mubodoginuzoxaxejeno.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/68081582411.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/judisuxejege.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/nifemujurodobesad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=wooden+window+design+catalogue+pdfPDF 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_off0000d4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 17220 bytes
SHA-256: 961f980e77d3f3bddf5b329b2f2a0b9f8ef295f1176201d0167fd488726d8dc0
font_01_sfnt_off000101c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 10876 bytes
SHA-256: 04138f6a1e47d6de917c24010b84b0755a1c16c636bdd9b97cb85695fae7263d
font_02_sfnt_off00011ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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