Malicious PDF — malware analysis report

Static analysis result for SHA-256 dccf9e5c183c3141…

MALICIOUS

PDF

86.1 KB Created: 2021-06-30 23:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6dd46251d5443525343eec06975d40c4 SHA-1: 2b2459cdb7b321b26d1e142667c450cc07c3a30b SHA-256: dccf9e5c183c3141347d645ef79a4fa8af5266db25f891036cb4c40440abc6ac
96 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 domains, indicating a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://lmyc.net/clients/875386/File/mujuvozut.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903e08ce15a---26539293534.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/38ed5195bd2c9452ba84e7c4881c7ab9/83581818138.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/lefenepuvor.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/60bjr7ig451tq9hbhc9hp7io97/podokuxaxepimitejox.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d492b23315---99372160579.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/u7ud43hrofh6rqn8at16amlmpg/7750680520.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//31789219338.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/436kmpsgum4kqdnihje21k6c40/vukipejomipafazomosetafos.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/5367jmr8ufiqa13oj3lnilge86/dikapukafop.pdf
    • http://amon-syotengai.com/userfiles/file/venodikogizugutad.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/a25b026aa86cff2caa408ecc6dcb75ae/57451647387.pdf
    • http://polyalpan.hu/_user/file/wotujaxakasitaruvekolej.pdf
    • https://damsindia.org/admin/uploads/file/41808683972.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a5287341a---38123735077.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e093586c---lefizunorisiripox.pdf
    • http://hi-techfiber.com/userfiles/file/90731520476.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607414aef40d5---xikijimalud.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0249b531d---gumad.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc535ea598---rixubonujemujowokul.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0cf695f36---3312449954.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/21b7205f00dc39e8cc86a756a2bbd213/giranojuromijatodewuda.pdf
    • http://files.ibiza-ferien.de/file/jebedabofek.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=easy+hot+lunches
    • 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_off0000ee0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 16792 bytes
font_01_sfnt_off00010621.bin
ae0f9bfbe805b441acc93a5dcb2e5d741c4d055bd58a40902a6bdf4096db1e3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10621 10332 bytes
font_02_sfnt_off00011d7e.bin
1fc8d12350609f1bf7a8952854ca0a5fe05f47b00ce9c9108d36e7363c6ea9fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7E 17584 bytes