Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f8b63d810db311…

MALICIOUS

PDF

103.9 KB Created: 2021-06-28 08:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9c147d2ab0f20442370c70096cfef741 SHA-1: 7cf8511075752bc58c8cb3ca430eea39b572eccf SHA-256: b7f8b63d810db311d97ad8d1023b2950f69eca06021f7781a96708aa7d1674a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://irlanc.ru/uplcv?utm_term=types+of+stoat PDF link annotation
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/u1mr8cgnj5h50b0a9fsn3dg0ha/52607734005.pdfIn PDF document text
    • http://dso-fuzine.si/docs/wirovuberos.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072feaa0ca63---82154062106.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/godegorepapodenabixufe.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a73e13787b8---kezibubifonorugifoxu.pdfIn PDF document text
    • http://ipceurope.com/assets/file/17830870311.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160794b50c2b45---dubitelomudolariliwure.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e726f2655---werinutufatavo.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/accce8ba95ee40adc260975ed2780d10/fikubewemogugozixusonimo.pdfIn PDF document text
    • https://avenue102.com/uploads/file/kejexomogaxa.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/96384430971.pdfIn PDF document text
    • http://talleresjpg.es/img/file/kuzubineferudenemosola.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb5d84d31f---jokererizulogisape.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085110af1deb---7484195340.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/e046bda351dc04e750cbaa43f65685bf/wuwubewiparotikupamo.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b312550dd26992be6095b0c6012d50e9/45654418142.pdfIn PDF document text
    • http://skncn.com/u/files/velone.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/h93ibmonqjoao6u22ofl3u3h7u/fadosato.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e954be9d1---fuledafoza.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/24622517650.pdfIn PDF document text
    • http://candientushinko.com/images/file/kevajid.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/ruzididedajanurelusixikab.pdfIn PDF document text
    • http://erex.hu/upload/file/5436677071.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ft83h5e8fu3gv9ccva640frivi/kupakilotajipoxu.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b63534040a---patadupexozisidoxubisiz.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_off00013350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13350 10084 bytes
SHA-256: cebbfca0052ee4dbfe443a283846d49ffa279a97b5e4bdb44001b9d003beaba6
font_01_sfnt_off00014a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16214 19152 bytes
SHA-256: 4808418fb8a0ca58cf0da86c237e1ee1cff419dc33a7f38dd84658616bb2ee65

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