Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b6b598088639fe…

MALICIOUS

PDF

122.1 KB Created: 2021-08-08 13:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8a804c52a97775fed70dfd0dd9f7612b SHA-1: a34fb74850809b0ee3672c9c9a2dbce39d241689 SHA-256: a1b6b598088639fecb225f87509214df7768671b0b3f6e9380a4ca57c5835296
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of numerous links on potentially disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://duz-drustvo.si/uporabnik/file/xewazesamibazuk.pdf In PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/5a4b9172e86546f10a12131e42c04630/25652037569.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609d95f71f071---xukijiwekepofeseribudi.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/67a6850f813dfda142e83e4b015105c6/kekejodebevijiwefiw.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7f7e76c08---filezuxivusimebimibevako.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a66d943b381---31235317197.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/45892185654.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/tojupesujujoxafi.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/68da997a411c62f484576386a7ff4e7e/75687562158.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/nv7cpnujr6o2vjh9j7v9aju97v/47757646230.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b9dcaf770---59454960743.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160780ff56a578---jowegeburudex.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/dimulofe.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0b5db44f5---9050302275.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075706c1778a---paxekaluvewowoga.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/fst1e0h3phusici55lh2nk6ej6/fojozerutixaj.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7929c1b7f---55077938413.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610958a2bf5f8---buxiruzumoja.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c54f985bf---98386258344.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/15264811875.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202105290529513818.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/6624225085.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/70267096722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=scrum+master+exam+questions+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17082 21028 bytes
SHA-256: 6c7c862e4825bd20084862aed21973ce9b474caee236ff7880639126b2b1dd7d
font_01_sfnt_off0001a782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A782 11156 bytes
SHA-256: d8eb3e0611c96fd039d2f33961cea51000d3fc2fea566cccf8d885e97131c6bb
font_02_sfnt_off0001c162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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