Malicious PDF — malware analysis report

Static analysis result for SHA-256 a862898bcb4e192a…

MALICIOUS

PDF

89.9 KB Created: 2021-06-25 19:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c33cd5d3a5941e83fb3604dc3a696517 SHA-1: d10a8eb3b54b5202a49fdde21553fcee8ff4070a SHA-256: a862898bcb4e192a32ac01a4d52db253911631620720b37d4463f0d6780e0f76
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous embedded URLs, many hosted on compromised CMS uploads, supports the classification as a phishing or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c96aff88539---47516671864.pdf
    • https://bamfieldrental.com/userfiles/file/72760166782.pdf
    • https://divinenine.net/userfiles/file/63543895512.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74e0322cbf---96812378597.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942c5eb93e9---35376344235.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/9fd353d71edc3025f3eb93f2b82c3be6/89699709526.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/9d1c479575ebaeb115f803b0941078cd/63997331939.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607019c313b14---vamutex.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31f32437f0---pubirezegokiwalepubivasu.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/828ae2f082fd4558eefb11a5b92d3c86/39813565676.pdf
    • http://gilendor.cz/userfiles/file/9285808093.pdf
    • http://ms-krmelin.cz/app/webroot/files/files/mejewexadowabujofezagala.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872d7e05e79---mifuzigasukolagomo.pdf
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/11140600232.pdf
    • http://planbmedia.hufiles/piminomitufezosomuliju.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab01e6be86---matopufamajawagesexoropo.pdf
    • https://easybuildapp.com/files/uploaded/files/46520819959.pdf
    • https://mednet.mk/public_html/upload/userfiles/file/61709553462.pdf
    • http://beautybybelief.com/admin/images/file/vawuxorasor.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2af7a7ca262c288fed90c1047a411bac/45568513310.pdf
    • https://anmimar.com/royal/userfiles/file/vinujexerapajenip.pdf
    • https://jagominum.com/contents//files/tuvawu.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/73325694840.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bcc7619e7---rirorul.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/sm6q8ou9k3nccar2gia9t694ou/lezijalam.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=eye+watering+and+sensitive+to+light
    • 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_off0000ff60.bin
414ae059ebd8a6b58fde2fc4dbe5b3a93f2d869b1439bd7934ad20ef651be40f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF60 16512 bytes
font_01_sfnt_off000129cd.bin
429b53871a21ce7470f04d89d8deda1294965846f44c5e11740a8c6d70b590f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x129CD 10776 bytes
font_02_sfnt_off00014265.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14265 16792 bytes