Malicious PDF — malware analysis report

Static analysis result for SHA-256 71005b465a9f5683…

MALICIOUS

PDF

91.7 KB Created: 2021-07-15 09:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72cf0cd199f5c7cb6f22e37f825493ce SHA-1: 8e800dbb21c37fce6631a3fcebc3e68ab9359726 SHA-256: 71005b465a9f56836876d552f757d3a3025cc1155c5bd0604f91ab3f471a8841
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the links and the PDF structure are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2b648d1d255d4229bc44c1b6bb549691/noposab.pdf In PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608167cae6468---taripiputewisun.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/90756683895.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/kixutadevavimub.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cae6eb8b4---7349412582.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/03cd8ffc048a6ac28d5533f6882edb4f/9824983243.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/16971868727.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794cf23a50d---fiboluxusosi.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/da8514ac47cebf7834b42c68d6f737a8/80083829565.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d08ed8ce75773e5c7dd05b97b6650802/26803337595.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/86681809243.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/mawutajomakipanesenav.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/56491610767.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/87285719843.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/48016657720.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/71254653242.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/wotizezejutufu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e88d89745b370a2559b39bcc6aa75063/kavajefesuxamijatit.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/wawuladosepubevig.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f07fdb5f3ce54c34958ab04c8b19a637/kobewotagado.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/68774957785.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/v642gafb5iq1vo716rboovibds/mitazumejiposo.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/48342186009.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/91089660080.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc7878ff56---81350560492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+convert+pdf+to+excel+macPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 10768 bytes
SHA-256: 6b7b8d1f27165158770cbbc22e9ed149b96cfd76b02457795ed4c0f7460e47af
font_01_sfnt_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 16572 bytes
SHA-256: 97e295771215332d05007d6b1a727e72f05d465e90ee2b84cd3f4260a64bc7bf
font_02_sfnt_off00013380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13380 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_03_sfnt_off000148ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1