Malicious PDF — malware analysis report

Static analysis result for SHA-256 868f9c7e2103fa4c…

MALICIOUS

PDF

100.0 KB Created: 2021-07-08 00:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a76deee46a5832118239ab05d5c1799 SHA-1: 039a90d430ec5a9aff6abe8ff07f5d89b2e7ced8 SHA-256: 868f9c7e2103fa4c6d7160f4ed270a7b43c6277269f9d1b22239a2a4d2242b46
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://refah4ter.info/basefile/hotelrefah4terir/files/nodofesugem.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e93d1f8ac507f2502186ab880a12edb6/65519260831.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/uqtr8f14h1a8vuba7on2nbi7i2/46139718595.pdf
    • http://lafayetteconnections.com/clients/52818/File/83510498328.pdf
    • http://iphysiology.ru/upload/pazugamulanepuwoz.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa25ad34e9c---nijazevosimonunuf.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a32a39d407a---75361173577.pdf
    • http://bezagsecurity.cz/userfiles/11701001900.pdf
    • http://pritchardreunion.com/clients/81409/File/fumilojebeganatigiwijexal.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095c8cbdcb81---zorafixubitiwerodewulani.pdf
    • https://sonntag-immobilien.lu/userfiles/files/36052951103.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1tj7kfmerilqb4g4khbmv193s4/6685359255.pdf
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/vomiv.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/2ce830ee111328ad6e14d9094fda1f73/8476623625.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965c30b6fca---56885475590.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092eac403aed---wevipukiji.pdf
    • http://apisicul.com/userfiles/files/24181394014.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/6lnmij8nn1npuodfekj1jtbvdr/pigebi.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d47b1dc3c1---33367954584.pdf
    • http://absolutelyneon.com/userfiles/file/rajusip.pdf
    • http://waukeganeast1980.com/clients/877304/File/62530270435.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/apuv8ukkvm4o4eee0u6qefpaf4/59824757710.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8edb1b565de3d33200dd43b79bab4c1c/32071423955.pdf
    • http://jun-travel.com/userfiles/file/sugez.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=first+love+marriage
    • 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_off00012322.bin
a64534557be8cb632fc511fe212e29009e0cbcaccd7d0338fb7ab106ada8fdf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12322 18596 bytes
font_01_sfnt_off0001534b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1534B 16792 bytes
font_02_sfnt_off00016b62.bin
c7ea45c0f14e6a7564dc2c5166be8190b1a39c6614164df0b68274b3e6c218b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B62 10392 bytes