Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea98da3a23dab74…

MALICIOUS

PDF

84.8 KB Created: 2021-08-14 17:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fc68cc14e4e444acbf4122f32a16871 SHA-1: 80f5ad5829500a5e8c00150bb9c2be17f482700f SHA-256: bea98da3a23dab74770526fad528ed838a3f1ddcbefffe5a9993313bce896920
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/fixep.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d37d04cf88f---futidufalazezal.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cec228a93---79965668311.pdf
    • https://mollis.rs//files/pipupo.pdf
    • http://mgtofubbq.com/uploads/files/79555690111.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/en7p38qqr807pc2ckusoc5ei46/bekubazixogod.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/qn9drccdf4u2278uqlf1o8b7s1/nakarujupon.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/bf3f90bb3b1587d3cab37496b4c93a57/25264435695.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e3206b27f1eb410433c9f1c1f13be717/sugedeselaku.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc48fb94cb---fejebub.pdf
    • http://www.childofafrica.org/media/userfiles/file/96966884157.pdf
    • https://chilegastronomia.cl/uploads/userfiles/files/fogibivuvezilekox.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092030dc6e58---15801975383.pdf
    • http://saluteebenesseresas.it/userfiles/files/nodijamuxizaforawagas.pdf
    • http://myexamadvisor.com/fck_uploads/files/61899065482.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/7kgssdg26iivaf1vc3atq9u3s5/79127740803.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/4c4764d5968ea69b379ea6708f3a026d/34221146809.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/58275774074.pdf
    • http://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/30798732011.pdf
    • https://amrapalispot.com/userfiles/file/tugopojinaperekowor.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5cc6144dd---piwudun.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67c73318c---62595647569.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076531bb6359---54908218542.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=4+ejemplos+de+fermentacion+acetica
    • 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_off0000ea57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 16792 bytes
font_01_sfnt_off00010269.bin
c61304cb7a3b954604a0900cb2dbf217a483ec14555322c7d040d9632da3bac1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10269 16140 bytes
font_02_sfnt_off00012aa7.bin
28dbb53d1275435da34901a367dfa543cc0eb5818b34a75f5d0b0372773d8da7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA7 10892 bytes