Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59e7b20b3d24b8d…

MALICIOUS

PDF

70.8 KB Created: 2021-09-30 18:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 01aacf53fdef509cc21bb1b7f15a4ede SHA-1: 54d9ed8cd2e30dafa3c0d38da40ec1f26fc5d6ad SHA-256: a59e7b20b3d24b8d3e2bfac5e668e968b85f562b82339c664a401a1869f223cd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/uplcv?utm_term=vocabulary+for+business+english+pdf PDF link annotation
    • http://alanurturizm.com/rsm/files/nupuz.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/67282180020.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/fewitivo.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144fb967559f---woxajarutalafikib.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/41853511343.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/1114515524614e3b4d8b4cd.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/tenuvavutetuxetikuvapi.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/97276974755.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/durutedafavitasuxu.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/42f615494873b5123530f7b914bb1218/64537654170.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/kopux.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/13965262970.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/16550709154.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/50109834321.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/18271062197.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613525f20a50e---45638516322.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e306a5d25---napixozinaxafa.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/tijuwipemepezujakip.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/dimukukixisal.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/8066494311.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/clrie695tmn4qbub33ddh1e1i8/rowupagelanosazujagos.pdfIn PDF document text
    • https://magerp.org/upload/files/difemebetepose.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/mobusoxifaga.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_off0000b324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB36 15856 bytes
SHA-256: 5f3045b99418ba9a7ea6b091f85f4c14a72f481cbf2255e43c1502ace8205e73
font_02_sfnt_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 11124 bytes
SHA-256: a20fa03375ea4b0eb366b16cb36a980c64fc762cfcbde6929a9487439b27b568