Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1b9525232ca70e…

MALICIOUS

PDF

91.5 KB Created: 2021-07-20 16:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7cd4e2ca21a1ecc156d31f5b4b3b3ce3 SHA-1: 4d530aff4d69ecdc2cf564ad38a527d0521f2c76 SHA-256: 0a1b9525232ca70eb6722d3ed7a06125a1a84a8a3c7090adc721e455b478e349
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/69537878804.pdf In PDF document text
    • http://goldcoil.com/uploadfiles/files/9152889963.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a3ea27ee4---36572017417.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/81041498445.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3bacf5fa88---61258408505.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/16569499949.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/bozatibetubiwokixizaki.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/79736864324.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d0b2d5d42---xegexuxabolas.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3c2b2222cc6f3295aeb9a473ce034f97/99543515562.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/d6ad4227247aebbe3cfd6426b8e7e3bf/kavok.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac89ff35bf6---87292345135.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/14d88cff909fd18c4647ecf9def2ee4b/9128809822.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/28740551551.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ce09c2192---44660112506.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/bogukovuze.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/kejuxekitifepojisixugo.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/39302798345.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc4cc92e82---futomewimakenof.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/49972124277.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/bbc867c29dc93814f36d51e8010588ca/kemerugogitogukufalazimad.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/35cc8e7e03a9fcef35f47e21d6169821/62461208360.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/xivakejatarovuwe.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806be767e33---sigeputisowi.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2870ede6e3ef65ec1f8dfea3f17aaaa1/30629773336.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/rutowigawikodo.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/45547857fd4f6e1b692bbcdb71f6aa73/68021045344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mad+max+full+movie+onlinePDF 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_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 17204 bytes
SHA-256: 6a04451a35ba75e42256319629a5c39bc2150731e2fafd8321e6d0af6fb394be
font_01_sfnt_off00013128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13128 10408 bytes
SHA-256: 6a5248dd5f1efc6c2580044af5c99d18bc817d8d1ff1b1cb0c8c7203361c0d9c
font_02_sfnt_off000148ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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