Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dba57bbc7c36637…

MALICIOUS

PDF

70.8 KB Created: 2021-09-07 07:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dee56b5361304012dd0bd630b1548153 SHA-1: 6c2bfa88fb5ce3ac35a5ffc94ffdc56562a4dae9 SHA-256: 7dba57bbc7c3663726382f40231d86f16b39ea9836a76810dd5219570f5e85fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and potentially malicious content. The heuristic firings suggest the document is designed to lure users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/uplcv?utm_term=parts+of+digestive+system+worksheet PDF link annotation
    • http://diakmelo.hu/ckfinder/userfiles/files/zijojagubuwivogovivadoge.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/nefederutipiso.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/torubikekikufato.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/9ab45d014e3e5a5c617c26256e2b3cde/joremavemob.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/65163411949.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/20144518833.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bac773aa9d3---20444915470.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/62699381328.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/q4h2qjbb8hf57alg30b6knffjf/zimubopoxizur.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fbed43ea3---39102829647.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee0236758f---gunosik.pdfIn PDF document text
    • http://tfforming.ru/d/files/84530186935.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/3bdbaf689c15dc7cd65f9a78fbe9733c/41439605584.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/6755357895.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc1556bd19---10416570786.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/fac7d2134664f559cc4cd993b72dbcaa/69773106685.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/zodosepijapisamibuwa.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/25984765342.pdfIn PDF document text
    • http://jaatkinson.com/userimages/23199049793.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/83618101984.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4e8606394---61495691341.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a712079e17---zedivasesixumi.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/23872202485.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085d9917af1a---netarosujubuguxuruxeje.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f77b7fb65fa35c11c1993531973b46ac/rirofuligadisunapodorol.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_off0000b561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB561 15432 bytes
SHA-256: 619e36a3fec03ad69476d51dc23e84b5c3fc119a3d80b2e8ce3897216de799c2
font_01_sfnt_off0000dc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 11008 bytes
SHA-256: fd904ddd2fd857a45f6637079ce161968ae6af6696f5748cc03459e57a1cc8e2

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