Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bcb7dbc466b74f9…

MALICIOUS

PDF

91.7 KB Created: 2021-08-30 16:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: be4ba18ca531f91efba6cfa6c8556551 SHA-1: 9e63e9ce11a2b09163695787e6609ae26a3c4cd5 SHA-256: 1bcb7dbc466b74f9a5142269bddde19b1de89d5dc6d5a120c9615e9a6f800754
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. These links likely serve to obscure the final malicious destination, which is a PDF file hosted on disposable domains. The ML classifier strongly indicates maliciousness, and the overall structure suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=find+mass+given+molarity+and+volume PDF link annotation
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087232540ea1---jovogepimibatenepebagej.pdfIn PDF document text
    • http://lhjmfamily.com/clients/5/5d/5d8645f74963a96e1aea25f3b610eff6/File/zazit.pdfIn PDF document text
    • http://edwardnugent.com/userfiles/files/98745473924.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/85536290067.pdfIn PDF document text
    • https://negaratoto.com/contents//files/97024361326.pdfIn PDF document text
    • https://ikansambel.com/contents//files/29275353489.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/v89cs9enq1ocnp233e3jmrd6h9/71135914736.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/gajoxibesebojagasoj.pdfIn PDF document text
    • http://fskyok.com//uploadfile/files/jemolevaxokimu.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/90281503268.pdfIn PDF document text
    • http://generoussecurity.com/uploads/xaxizuxitawazebojivin.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715477ad59d---1636723799.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/f2f3790c84d8772fc92b75b82309eb44/bisanuperimosamenunixig.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/c8bf00d1133afd88840e13c0f669a332/909982356.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/kodonopotokonatepaj.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/fejededik.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/64176083120.pdfIn PDF document text
    • http://araratmebel.ru/img/file/56999438672.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/67113132785.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/worezunidiparobesipoxorij.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210807_025358.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/1272376617.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/35968814930.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/gegabobilubozawuxupiki.pdfIn PDF document text
    • http://poolprotektor.com/userfiles/file/29587789209.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_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001155b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155B 19220 bytes
SHA-256: e2df86f7c6d13272f7b5c4b6f5daa9fe1c348b04eaf1809e11608723b2611325
font_02_sfnt_off000146e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E8 10848 bytes
SHA-256: 65d459ae1bb96f1ff072f4157170dc4924a64155486e5aabe8da8ce228b1691b

Open this report in the interactive analyzer, or submit your own file for analysis.