Malicious PDF — malware analysis report

Static analysis result for SHA-256 92910673290c82aa…

MALICIOUS

PDF

97.7 KB Created: 2021-09-15 16:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7344de37a4c2266ddf4ef8299b2327ad SHA-1: 8023b7dc8143cd384c58ee7ba9dafe910ed06654 SHA-256: 92910673290c82aa3ac4646b6c101119cfe9e538ae2ab5b9af7c2cdc502f86cd
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to disposable domains or compromised CMS upload storage, indicative of a link farm used for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://atenngo.com/admin/sites/site/documents/devibapub.pdf In PDF document text
    • http://tcihk.com/userfiles/rusokilikusufokedukefum.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/wajipane.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16131469a19e4a---89193579913.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/bejufamukofosor.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109122317517419.pdfIn PDF document text
    • http://rooptex.com/uploads/47787837937.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f30399d317---wawutaxozilawo.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/muwawetaratawisudexonaki.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/48031937041.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613379ba89abb---kofexukeguj.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/rokifenomusige.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/25333545181.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/rodof.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161324798106e2---fepalavejafesagakax.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/zumenixedo.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/29019220852.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/20193693129.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/bekokibewuderatefotex.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/18005440984.pdfIn PDF document text
    • https://profesa.net/userFilesfile/46650585120.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109061642186845.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/9888411981.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161353a91268b4---xododevitofenir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=veilige+modus+android+uitschakelenPDF link annotation
    • 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_off00011ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE8 17600 bytes
SHA-256: ef01b53d7218234e89d26f85146db7d4f791808be743d272bdc9c621691a7fb9
font_01_sfnt_off00014836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14836 10976 bytes
SHA-256: 2474264a74b61005590f9f07747139f8d58ad4da50bbed3c10eb1124ba751b2b
font_02_sfnt_off00016153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1