Malicious PDF — malware analysis report

Static analysis result for SHA-256 950e7f18d648acbf…

MALICIOUS

PDF

89.7 KB Created: 2021-07-07 01:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f9125bd2583ba0745ee7a3956cd2f4a SHA-1: 0f8c4fa954bdeaf95c376397581da38f4afcbcf1 SHA-256: 950e7f18d648acbfecadc69ef589e4106032a987895247a6e4b75d0c0ff20092
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://girilawfirm.com/content_files/files/93914849185.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/1d1272054064800857952da91fb93267/ferubibelomonuwuzofasa.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/89f6332e676b0f241669cfea51e9c91f/dimixubapurikeki.pdf
    • https://people11people.com/uploads/File/42000002165.pdf
    • http://sjhrz.com/images/upload/File/zutizeloladoxaxaxuvexig.pdf
    • http://simonide.org/userfiles/file/86200842703.pdf
    • https://crownprolaw.cn/userfiles/Proj_Name//files/61715510958.pdf
    • http://headrepublic.pl/images/files/338145158.pdf
    • http://szpital-sulecin.pl/images/fckfiles/file/85034700709.pdf
    • http://baggiez.net/userfiles/file/nibinitesowukidakojizi.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/borotanajegedera.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/gewasulegokixukikef.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16097ff0f3993c---kajipolokirelaka.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6a0e3eb58---dodebonev.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/u3pq175pv2puer2rbds4vqscn1/50693379287.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/xesotosobemepidufizowo.pdf
    • https://aucordechasse.fr/vosImages/duwafud.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160add9586bd78---93509606648.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/56b898af16af5f6ffbfd8880f1458238/24595713432.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e8c6d3d8---90415578377.pdf
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/15263515662.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5cdca8099---37851306383.pdf
    • http://szpk.hu/_user/file/53574864226.pdf
    • http://tanriovermensucat.com/uploads/genel/files/mekopurerigagezivotuk.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=bollywood+full+movies+watch+online+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_off0000f98f.bin
9317007d950ec30adea1bf5f84ae3dc65a8cbc09a0eb3667128a05c5c4926338
pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 16932 bytes
font_01_sfnt_off00012586.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12586 16792 bytes
font_02_sfnt_off00013d9d.bin
3a70f9b64af2c6aa1951464c1244bdd7d75c6328f7a5d44fa905b5b7e8bea160
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9D 11160 bytes