Malicious PDF — malware analysis report

Static analysis result for SHA-256 bccd8dd389734831…

MALICIOUS

PDF

91.1 KB Created: 2021-08-09 19:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 62610cc46abf3b0848eb1e04042f84f7 SHA-1: d7fb888185b9f8b57e743b0630af4d713e2c86ef SHA-256: bccd8dd3897348317bad231a91310196b744fdd9aed5849ea2e57fb082000857
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of link farms suggests an attempt to redirect users to malicious content or phishing sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/uplcv?utm_term=can+you+get+a+hickey+from+pinching PDF link annotation
    • http://rhodeislandalpha.com/clients/56223/File/xibitolefobewabolalamato.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/id706h6c2ntot95c156b8hkbss/xorexusuniro.pdfIn PDF document text
    • http://qachs88.com/clients/58271/File/6811723829.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/11123455508.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160729e946e94a---mazozurobudaxejax.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/mitinupiputozupizegenuru.pdfIn PDF document text
    • http://midel.me/userfiles/file/matifijodoluluxijag.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/bupeb.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f5418r9nvkm7mfk3n5p8ruagmm/vomarasexivo.pdfIn PDF document text
    • https://amblamy.ee/upload/file/65288605267.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/32887522330.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a7513de7a7bc5c3fa2b5882a23d3d0b5/95999474071.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160fe54df242cf---19772539219.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210531060121.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/38607522980.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/1d24f894cfd786a25fb6f32a87ddaf68/donabeg.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/jovovukupivuwibarozawew.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b82b4aec19---pakigotulovepale.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/63295012137.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/1ca4418979b47a7cf24b96163af41b71/sefijapejur.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc046b2a54---xozun.pdfIn PDF document text
    • https://begili.com/uploads/image/files/59885288387.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c4364322---9148107634.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_off0001006f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11886 11048 bytes
SHA-256: 08f7f88661e2eeb47a58af6fb7a2534ae355badde4f7bd95aed7d8560241c376
font_02_sfnt_off00013221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13221 17232 bytes
SHA-256: 1d62bb24327507773360775527e912762e36811ad22ae65d019e12f343bbd2a0