Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5959394023da7c…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 09:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8d35af2061ac30ac7599a4fba0ead25b SHA-1: 71c1cb4b274cf419f875b889bd1e83a044e35f8f SHA-256: be5959394023da7cc39ede8abf531fc01b97e917699655b102aa8b7e6a34ad64
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or for SEO manipulation. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs supports a pattern of external resource engagement. No scripts were extracted, limiting the ability to determine specific execution methods beyond the initial document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://chcial.ru/uplcv?utm_term=fungsi+manajemen+strategi+pdf PDF link annotation
    • http://remont-etalon.ru/upload/files/48675518833.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/busabotutezufaxewumopi.pdfIn PDF document text
    • https://aedwea.com/upload/foto/xivexupijatefotebavonof.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/kazudovejofelipaxivujima.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/49991096572.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5d9adfb73ed8b770c171d0e5daad71ec/73178106758.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/urhvggtbd0r4ufjpe3t3mlj282/dodatepuwelusixopo.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/69001836029.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d92dd7270e---legozivizilox.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/d623579e21f50adc287e961be47b457d/82596483343.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da53cb6ff9---5871345824.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/juloxokowaka.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3dc9212c2---wevinu.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/10761126545.pdfIn PDF document text
    • https://le27.fr/docs/file/69631333724.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/fa218444e17ecaa7d29923a9f47f2e37/kexopizes.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/9e22b10fb6ce215f43b91e01ccc6cdda/wekajixazikoji.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160dae79035947---71005390913.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/pinadobufawojar.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d121c53a75---sefuwavesefaxonenipojug.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160894a535a0c6---rexesevakevi.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/6e8dfb957af7701ace2d212987d979a2/nefobesofifigiwitomiwofa.pdfIn PDF document text
    • http://farmina.ru/uploads/files/guvulafekapubafisorilixu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F1 17012 bytes
SHA-256: be88f7b05649f211f69f76aee4b92ab5b798380576322a81fefc7b450a84b502
font_01_sfnt_off0001142c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142C 10880 bytes
SHA-256: fb28f896717d6d07ef9be8f560c7bc1bdd070aec7e5e00693d577a8f331f73be
font_02_sfnt_off00012d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1