Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6a3733c717c1e7…

MALICIOUS

PDF

116.9 KB Created: 2021-06-30 01:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f5b8f9d4e817403dd4069eb60372d09 SHA-1: bdf8b7842c409a1ff96416aff9fd488eb08bb5bb SHA-256: 7e6a3733c717c1e7a28b428082bddf1603cad0fea2ae80cb6feaa896fc237777
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of numerous links to potentially malicious files indicates a downloader or droppper pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160791b80e85d2---25229284787.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0c709b5f85388523d5bb1a965689e666/6874434598.pdf
    • http://alphaconsultinggroup.us/vpw/images/file/jirox.pdf
    • http://whatifitspossible.com/ckfinder/userfiles/files/15176075278.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/2373f5b4ac719fa1b256d796b2cd8241/80053279922.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fce98f408---kamedibafererowuza.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/11058300378.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2c391b6f5---vekowedobuzajepepas.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aace48b94b0---85962121021.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/tebemot.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160845789123cd---33786271298.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/nrnlcrvvhfso92kc08kl2jktk4/mepasojegufibuvujog.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb6e241f8a---fuvijalarak.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/4ako7bhcfn3ik376psoiq5lo77/79928446517.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c085a97327a---34467608593.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c16845545d5---mifegiru.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/bbc81f5aee0d8491cf08c2e4e29dd831/subudulagakemezijo.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba42cc6dde---kapinurow.pdf
    • https://caribemed.com/userfiles/file/27583059255.pdf
    • http://archerelectricsupply.com/userfiles/file/zifidusuzidofadepigut.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090434283b85---nudisurolufizudu.pdf
    • http://hornets88.com/clients/56662/File/29631281054.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8493f7b61c---89396772618.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb678178d---bilukorobowejaxor.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=journal+of+guidance+and+counseling+pdf+2018
    • 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_off00016240.bin
1e1fb40ab6bcca1be8ab8231b598754f2e2960429632c1a1e621a069b8eea899
pdf-font-stream PDF embedded font (sfnt) at offset 0x16240 18712 bytes
font_01_sfnt_off0001939b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1939B 16792 bytes
font_02_sfnt_off0001abb2.bin
f42b485bf02b3af3597029516d8c000bb42ea74a7243aca99b454815dccb19d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABB2 11288 bytes