Malicious PDF — malware analysis report

Static analysis result for SHA-256 455957cd6f1872e8…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 00:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: f9793abe14bb1d96b0d588d906458458 SHA-1: 07816a276465faa48b896a533eb6c88706e9ff63 SHA-256: 455957cd6f1872e8959f00d450eba76c3abb64fb9e846fcaf0aecb523b5db3f7
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=minecraft+horror+maps+for+2+players PDF link annotation
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/42cec34328100d328afbd2d3ced669ca/nubobevapitazoxigemujo.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/58999280667.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/mujuzitakitidokasitu.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/75443826935.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/eaa5f80083209a0ac15b19924c4bf7f6/80281185172.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/lexebobojevamipixefuvi.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/84990869172.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/28779548131.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/97080051709.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160d6749e2ea4c---ludogodesiziladibupozusuf.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/jeragoside.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/4p1bdk213th102q2d2l3k8ipb6/83960337357.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/75009504243.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55312449226.pdfIn PDF document text
    • https://htapigroup3.com/contents//files/14930033764.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/29673396331.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607140945b500---pepoxinovitezesaz.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16075174ae9968---nomogore.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/jebawojizuju.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f92aa2cfe6---24922293026.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c31d175b4e6---nubitomofikuvonizapobof.pdfIn PDF document text
    • http://dztechfin.com/upload/file///xuvexig.pdfIn PDF document text
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/94136014536.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_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 17568 bytes
SHA-256: ef10aa241a0a13b2a8d87a6cc1f1eaa9d9a735d47bf6f7aa71fb04e5fb757f52
font_01_sfnt_off0001111b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111B 10972 bytes
SHA-256: 1105fc7d1610fea90e050772f5076a44b7773412fa33b57ede896ff3eba7c226
font_02_sfnt_off00012a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1