Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c6e0312317847f…

MALICIOUS

PDF

85.4 KB Created: 2021-09-20 09:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6da6e5d493a941af4b936a2f4de5cd18 SHA-1: 6c8f9b14e23e8a637fe3486b712b7dca9be00cbf SHA-256: a5c6e0312317847fd0f222a5d2d8ef5cec0e03589ded4456af763e6682315014
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Installation

The PDF document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_SECURITY_BYPASS' indicates the document explicitly instructs the user to disable security software, a common tactic in phishing and malware delivery. The ML classifier strongly flags this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://allytemp.ru/uplcv?utm_term=parsingfehler+android+beheben PDF link annotation
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa36d72e00---dojopomomajaxarev.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/60781114337.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dd7962c9d---fonikal.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/dadopipezugoxulokofulo.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/wefajodutufekigakipiv.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/58711140294.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/35052480935.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/1187087382.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/72258991635.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/99992861105.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ccs38ua5c9q46dgl6d1hrrpgo5/67201975277.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/dehgfocagen3m6l9f0daiegrek/gamolenelixav.pdfIn PDF document text
    • https://papiratisk.cz/soubory/84449661990.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/rosiporipajedip.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/93804866235.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/17642326719.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/82698004158.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/47007930133.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/mupagirigefobaba.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210908172827.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/7009199287.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/kibubozemirebarinapo.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/99474528307.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/57959679750.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/41151515621.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_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 10676 bytes
SHA-256: 07bd4dc1c219321d417243299a757438805f5c51c9b93bf14609be654e1bd5aa
font_01_sfnt_off0000fe49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE49 19228 bytes
SHA-256: 1508146327495a6d50a80c67656ae6c28ec827574cef5bb6a1c9761149c1926d
font_02_sfnt_off00012e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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