Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7b1648046ddf36…

MALICIOUS

PDF

81.2 KB Created: 2021-06-19 11:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84774243f14b3b198f55fa27af1fac81 SHA-1: ecc1eabe7a33b6a373316ff48f991e4c2cfea897 SHA-256: ae7b1648046ddf368e1a619909cceccb4a668700361deb602c9d9723fe6230b1
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URI heuristics suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=country+guitar+licks+tabs+pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a114002598---keduxobexivusuvan.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/fc519df53f7f51d13fefc39f79221942/46212677320.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607189ee68dfc---77857323349.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16080a5d9c5ea4---40573195028.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/v3jhhdpevs8jbbu3lu687as2ha/risesivojimemivisew.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/qdkjgrohrrl4sjvkgalcc5vnn1/21738541286.pdf
    • http://asupuro.com/user_data/image//file/72087632516.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b361ed73a12---bekixelelaninupumojinogub.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/js91fkkicv4n7ohbngmu6snibn/551328047.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/46cf3b8914221a1122e7a75579419781/10954256013.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fd28da4c---tesulupelur.pdf
    • https://cortemadera.com/wysiwygfiles/file/32351217689.pdf
    • https://morabia.fi/images/file/zurigaraxeja.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/5fa95db4f3f92d9ef5523ecb77482ffa/73783091783.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc31.bin
64dcddd341d276b5885d64c15495383ef64fff33312bd2a26dd0174eeafaa6d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 5416 bytes
font_01_sfnt_off0000eea9.bin
2a9e0c64f380513889718d6726aec800860462890c7087b4c68282d0fc982d55
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 11076 bytes
font_02_sfnt_off000114ba.bin
46d9b83afd797048ab251ddfc9ca9a6db44f3280724c231f6a80a061bcc6fc12
pdf-font-stream PDF embedded font (sfnt) at offset 0x114BA 16120 bytes
font_03_sfnt_off000129a3.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x129A3 4324 bytes