Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae92a3cde3064920…

MALICIOUS

PDF

125.5 KB Created: 2021-07-05 08:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7cf6f7a71830d8344de18c586ee34d10 SHA-1: b37e85bacbe8967496bb3c0faacab29782af45c8 SHA-256: ae92a3cde3064920a2f5049740390226e0e401e6b276aa7b948e4e4e7754bfa1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links, combined with the PDF's structure, indicates an attempt to redirect users to potentially harmful external resources, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ead3a68dd4f7414a407cea27300301d1/jowesobufaruxikomurosa.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/a6a8lqt1n8793l6r6tuup2bvd6/10531498982.pdf
    • http://freetourscadiz.com//ckfinder/userfiles/files/74243378622.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078acec13ae7---10751645166.pdf
    • https://aaaxxion.info/images/file/94593555015.pdf
    • https://producedepot.us/userfiles/files/45440786304.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b181397fe---92088755952.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a60cfbe723d---nivuzuludesekiduses.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/uo8sob8et729neq0haniqv3st4/57096226448.pdf
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/48559722670.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/2b520c86edc1535cb50420137d346bc6/73078269008.pdf
    • https://advertisementnepal.com/ckfinder/userfiles/files/45735892346.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/c05037aabed856968797ae0161145103/162470473.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/8f6fbab8b8a27263045855c96c404838/70897985384.pdf
    • http://azseal.net/uploads/userfiles/file/waxifabifusivemosoruj.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/bonumawapevubezo.pdf
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210629_582FAD5F2867E9A5.pdf
    • https://biomedchita.ru/imeg_master/file/midajutabe.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5092c0d5f2---dinagowutix.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/v03vv74tglnshrbtomnqtp55v1/98207601380.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/fa5fgsoo4kuerv9dguu7dd2666/24069043188.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b899cf4bf49---55762134634.pdf
    • http://abacusnancy.com/userfiles/file/rokakor.pdf
    • http://micronforgacsolo.hu/UserFiles/file/55882134646.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=get+the+sims+4+expansion+packs+for+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018809.bin
948b8ee74542c92f765b672c2005bedabc0c902760f371771951f60a5e80e0de
pdf-font-stream PDF embedded font (sfnt) at offset 0x18809 17880 bytes
font_01_sfnt_off0001b6c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6C1 16792 bytes
font_02_sfnt_off0001ced8.bin
608e575a354fb167cd75ff8b45116ea64052be19fcc2ca2b72213ab6fc551301
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CED8 11008 bytes