Malicious PDF — malware analysis report

Static analysis result for SHA-256 89914bb964199ae5…

MALICIOUS

PDF

82.9 KB Created: 2021-06-26 02:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7cab69983c1922d2362b1311ce62d7a9 SHA-1: 38e420f82b165dcbf52e05d10ab5e2b91e5aada1 SHA-256: 89914bb964199ae589d889c9511ff7244316d3d40ca11397736dedd6bc4f8ebf
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating an attempt to host malicious content or redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL patterns suggest a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b572dc0bb4b7591cd834d120ef4b5bad/nobomipaw.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/3c8iem017eouomevtj4geqqc6g/rejewirasafo.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/d0b3b6aec522edc5f2db02a78c9e464a/tivabisos.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769ae5540f6---8866370872.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d13c2a7538---fovoto.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16084841bdaf84---50598787584.pdf
    • https://honda-otolongan.com/upload/files/jokiripolawinubufinaditap.pdf
    • http://webinaris.net/ckfinder/userfiles/publics/files/18085313946.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6258a12d4---fexajozobewugokalarawib.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85c0b54ed7---85039431529.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/rqohmsdhfbr5eo0p43c03opcp9/wajipumad.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/780c3822e34cde77cbec43ce3fb10b33/98426125016.pdf
    • http://perles-del-beya.com/userfiles/file/wufupudofijexo.pdf
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64056318621.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/poieubltapb23jvelv1m7insfs/gedakejejod.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fda30b8fa7---xabomonuniralumujefal.pdf
    • http://poorclarescork.ie/images/38521595988.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ec3f3bfd---61354371470.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d74da973a---xosotidonelevimulesij.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4b75c47cd---fefavemeja.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607682ab6c28b---74065692647.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608674c32c475---zadegivasupasuxolovo.pdf
    • http://baaningdoi.com/file_media/file_image/file/3562875921.pdf
    • http://sfera-vlad.ru/img/file/6271494697.pdf
    • https://alianzatours.com/imagenes/file/taxotigelipuxapuwokolu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pokemon+gold+and+silver+cheat+codes
    • 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_off0000e183.bin
6316563a198ca8ed78acfed1ee1942c6f77208e44fcd12256e6e9773cc4ccddc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 10976 bytes
font_01_sfnt_off0000faa4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA4 16792 bytes
font_02_sfnt_off000112b6.bin
70c8eacbb6f6bc6f79fc666f287b896599a57e389bef548935d6e83a45b1ca98
pdf-font-stream PDF embedded font (sfnt) at offset 0x112B6 16676 bytes